In a row, R is 7th from left and S is 10th from right. If they interchange, R becomes 12th from the left. How many persons are in the row? MCQ with Answer and Explanation

Question

In a row, R is 7th from left and S is 10th from right. If they interchange, R becomes 12th from the left. How many persons are in the row?

A. 22

B. 20

C. 21

D. 19

Answer: Option C

Solution (By JKSSB Mock Tests)

S's original left position is R's new left position, 12. Total = 12 + 10 - 1 = 21.

This question belongs to: Reasoning Mental Reasoning

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Question #1

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If 5 is coded as 25, 6 as 36, 7 as 49, then 8 is coded as?

A. 64

B. 81

C. 72

D. 56

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Correct Answer: Option A

Explanation:
The code is n²: 5²=25, 6²=36, 7²=49, so 8²=64.

This question belongs to: Reasoning Mental Reasoning

Question #2

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A man walks 2 km east, then turns left and walks 3 km, then turns right and walks 2 km, then turns right and walks 3 km. In which direction is he from the starting point?

A. West

B. East

C. North

D. South

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Correct Answer: Option B

Explanation:
He moves east 2 km, north 3 km, east 2 km, then south 3 km. The north-south movements cancel, so he is east of the start.

This question belongs to: Reasoning Mental Reasoning

Question #3

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Pointing to a woman, a man said, 'Her father is the son-in-law of my mother.' How is the woman related to the man?

A. Daughter

B. Niece

C. Sister

D. Cousin

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Correct Answer: Option B

Explanation:
The son-in-law of the man's mother is the husband of the man's sister. His daughter is the man's niece.

This question belongs to: Reasoning Mental Reasoning

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