[Mission 2024] Insta–DART (Daily Aptitude and Reasoning Test) 14 May 2024

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Considering the alarming importance of CSAT in UPSC CSE Prelims exam and with enormous requests we received recently, InsightsIAS has started Daily CSAT Test to ensure students practice CSAT Questions on a daily basis. Regular Practice would help one overcome the fear of CSAT too. We are naming this initiative as Insta– DART – Daily Aptitude and Reasoning Test. We hope you will be able to use DART to hit bull’s eye in CSAT paper and comfortably score 100+ even in the most difficult question paper that UPSC can give you in CSP-2021. Your peace of mind after every step of this exam is very important for us.

Looking forward to your enthusiastic participation (both in sending us questions and solving them on daily basis on this portal).

Wish you all the best ! 🙂

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• Question 1 of 5 1. Question Direction for the following 5 (five) items: Consider the given information and answer the five items that follow: ( 1-5Q) Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. The difference between the ages of Kavya and Malika is 3 years. Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. There are three girls sitting between Kavya and whose age is 18 years old. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Charu is one year older than Richa. Who is 13 years old? (a) Kavya (b) Prachi (c) Malika (d) Cannot be determined Correct Solution: D) Cannot be determined Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 Hence, option (d) is correct. Incorrect Solution: D) Cannot be determined Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 Hence, option (d) is correct.

#### 1. Question

Direction for the following 5 (five) items: Consider the given information and answer the five items that follow: ( 1-5Q)

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

There are 2 persons sitting between Swati and the one whose age is 18 years.

Neither of them is sitting at an extreme end.

The difference between the ages of Kavya and Malika is 3 years.

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years.

There are three girls sitting between Kavya and whose age is 18 years old.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati.

Charu is one year older than Richa.

Who is 13 years old?

• (b) Prachi

• (c) Malika

• (d) Cannot be determined

Solution: D) Cannot be determined

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

Hence, option (d) is correct.

Solution: D) Cannot be determined

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

Hence, option (d) is correct.

• Question 2 of 5 2. Question How many persons are sitting to the left of Sheena? (a) Two (b) Three (c) Five (d) Four Correct Solution: D) four Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 There are four persons sitting to the left of Sheena (Kavya, Swati, Prachi and Malika) Hence, option (d) is correct. Incorrect Solution: D) four Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 There are four persons sitting to the left of Sheena (Kavya, Swati, Prachi and Malika) Hence, option (d) is correct.

#### 2. Question

How many persons are sitting to the left of Sheena?

Solution: D) four

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

There are four persons sitting to the left of Sheena (Kavya, Swati, Prachi and Malika)

Hence, option (d) is correct.

Solution: D) four

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

There are four persons sitting to the left of Sheena (Kavya, Swati, Prachi and Malika)

Hence, option (d) is correct.

• Question 3 of 5 3. Question Consider the following statements about transgenic animals: Transgenic animals can be used to study the function of specific genes and their impact on development. The majority of transgenic animals used for research are rabbits. Transgenic animals have been developed to produce human proteins for therapeutic use. Testing vaccine safety using transgenic mice can reduce the need for animal testing in humans. How many of the above statements is/are correct? a) Only one b) Only two c) Only three d) All four Correct Answer: c Explanation: Transgenic animals are organisms that have had foreign DNA deliberately inserted into their genomes. This genetic modification is done to study gene functions, model human diseases, produce pharmaceutical proteins, and improve agricultural traits. Transgenic animals are commonly used in research to understand gene functions, regulatory mechanisms, and their effects on development and disease processes. Hence, statement 1 is correct. The majority of transgenic animals used for research are mice, not rabbits. Mice are preferred because of their genetic similarity to humans, short reproductive cycles, and the extensive availability of genetic tools for manipulating their genomes. Hence, statement 2 is incorrect. Transgenic animals have been engineered to produce human proteins. For example, transgenic goats have been created to produce antithrombin, a protein used to prevent blood clots, in their milk. Hence, statement 3 is correct. Transgenic mice can be used to evaluate the safety and efficacy of vaccines, potentially reducing the reliance on human subjects for early-stage testing and providing valuable preclinical data. Hence, statement 4 is correct. Hence, option (c) is correct. Incorrect Answer: c Explanation: Transgenic animals are organisms that have had foreign DNA deliberately inserted into their genomes. This genetic modification is done to study gene functions, model human diseases, produce pharmaceutical proteins, and improve agricultural traits. Transgenic animals are commonly used in research to understand gene functions, regulatory mechanisms, and their effects on development and disease processes. Hence, statement 1 is correct. The majority of transgenic animals used for research are mice, not rabbits. Mice are preferred because of their genetic similarity to humans, short reproductive cycles, and the extensive availability of genetic tools for manipulating their genomes. Hence, statement 2 is incorrect. Transgenic animals have been engineered to produce human proteins. For example, transgenic goats have been created to produce antithrombin, a protein used to prevent blood clots, in their milk. Hence, statement 3 is correct. Transgenic mice can be used to evaluate the safety and efficacy of vaccines, potentially reducing the reliance on human subjects for early-stage testing and providing valuable preclinical data. Hence, statement 4 is correct. Hence, option (c) is correct.

#### 3. Question

Consider the following statements about transgenic animals:

• Transgenic animals can be used to study the function of specific genes and their impact on development.

• The majority of transgenic animals used for research are rabbits.

• Transgenic animals have been developed to produce human proteins for therapeutic use.

• Testing vaccine safety using transgenic mice can reduce the need for animal testing in humans.

How many of the above statements is/are correct?

• a) Only one

• b) Only two

• c) Only three

• d) All four

Explanation:

• Transgenic animals are organisms that have had foreign DNA deliberately inserted into their genomes. This genetic modification is done to study gene functions, model human diseases, produce pharmaceutical proteins, and improve agricultural traits.

• Transgenic animals are commonly used in research to understand gene functions, regulatory mechanisms, and their effects on development and disease processes. Hence, statement 1 is correct.

• The majority of transgenic animals used for research are mice, not rabbits. Mice are preferred because of their genetic similarity to humans, short reproductive cycles, and the extensive availability of genetic tools for manipulating their genomes. Hence, statement 2 is incorrect.

• Transgenic animals have been engineered to produce human proteins. For example, transgenic goats have been created to produce antithrombin, a protein used to prevent blood clots, in their milk. Hence, statement 3 is correct.

• Transgenic mice can be used to evaluate the safety and efficacy of vaccines, potentially reducing the reliance on human subjects for early-stage testing and providing valuable preclinical data. Hence, statement 4 is correct.

• Hence, option (c) is correct.

Explanation:

• Transgenic animals are commonly used in research to understand gene functions, regulatory mechanisms, and their effects on development and disease processes. Hence, statement 1 is correct.

• Hence, option (c) is correct.

• Question 4 of 5 4. Question Who is sitting second to left of Naira? (a) Prachi (b) Charu (c) Malika (d) Sheena Correct Solution: C) Malika Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 Malika is sitting second to left of Naira. Hence, option (c) is correct. Incorrect Solution: C) Malika Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 Malika is sitting second to left of Naira. Hence, option (c) is correct.

#### 4. Question

Who is sitting second to left of Naira?

• (a) Prachi

• (c) Malika

• (d) Sheena

Solution: C) Malika

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

Malika is sitting second to left of Naira.

Hence, option (c) is correct.

Solution: C) Malika

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

Malika is sitting second to left of Naira.

Hence, option (c) is correct.

• Question 5 of 5 5. Question How many girls are sitting between Kavya and Swati? (a) One (b) Four (c) Two (d) None Correct Solution: D) none Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 Kavya and Swati are immediate neighbours. Hence, option (d) is correct. Incorrect Solution: D) none Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North. They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order. There are 2 persons sitting between Swati and the one whose age is 18 years. Neither of them is sitting at an extreme end. Therefore, Swati is not sitting at extreme end and her age is not 18 years. The difference between the ages of Kavya and Malika is 3 years. Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible Richa is sitting second to right of one having age 18 years. Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years. There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years. Thus, Richa is sitting second to right of Sheena. Prachi and Malika are immediate neighbours. Richa is not 31 years old. There are at least 4 persons sitting to the right of Kavya. Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours. The one who is 31 years old is not sitting at second position from any end. Sheena is 3 years older than Swati. Thus, age of Swati is 15 years. Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25. Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years. Arrangement from left to right in north direction is Kavya Swati Prachi Malika Sheena Naira Richa Charu 10/13 15 40 13/10 18 31 25 26 Kavya and Swati are immediate neighbours. Hence, option (d) is correct.

#### 5. Question

How many girls are sitting between Kavya and Swati?

Solution: D) none

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

Kavya and Swati are immediate neighbours.

Hence, option (d) is correct.

Solution: D) none

Eight people – Swati, Prachi, Richa, Kavya, Sheena, Charu, Malika and Naira are sitting in a straight line facing North.

They have different ages – 10, 13, 15, 18, 25, 26, 31 and 40 but not necessarily in the same order.

The difference between the ages of Kavya and Malika is 3 years.

Thus, possible ages Kavya and Malika are (10, 13) or (13, 10) . Because it is given that age of Sheena is 18 years. Thus, possible ages Kavya and Malika (15, 18) or (18, 15) are not possible

Richa is sitting second to right of one having age 18 years.

Prachi is sitting third to left of one having age 31 years. Thus, Prachi’s age is not 31 years.

There are three girls sitting between Kavya and Sheena whose age is 18 years old. Therefore, age of Sheena is 18 years.

Thus, Richa is sitting second to right of Sheena.

Prachi and Malika are immediate neighbours. Richa is not 31 years old.

There are at least 4 persons sitting to the right of Kavya.

Naira and the one having age 18 years are immediate neighbours. Thus, Naira and Sheena are immediate neighbours.

The one who is 31 years old is not sitting at second position from any end.

Sheena is 3 years older than Swati. Thus, age of Swati is 15 years.

Charu is one year older than Richa. Thus, age of Charu is 26 and age of Richa is 25.

Since, it is given that age of Prachi is not 31 years, Prachi’s age is 40 years and Naira’s age is 31 years.

Arrangement from left to right in north direction is

Kavya Swati Prachi Malika Sheena Naira Richa Charu

10/13 15 40 13/10 18 31 25 26

Kavya and Swati are immediate neighbours.

Hence, option (d) is correct.

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