UPSC Prelims 2020·CSAT·Logical Reasoning·Arrangement and Puzzles

A is 16th from the left end in a row or boys and V is 18th from the right end. Q is 11th from A towards the right and 3rd from V towards the right end. How many boys are there in the row?

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Last updated 8 Jul 2026, 4:39 pm IST
  1. A40
  2. B41Correct
  3. C42
  4. Dcbd

Explanation

Here's a brief explanation:

  1. Find Q's position from the left end: A is 16th from the left. Q is 11th from A towards the right. So, Q's position from the left = 16 + 11 = 27th.

  2. Find Q's position from the right end: V is 18th from the right end. Q is 3rd from V towards the right end. This means Q is to the right of V, and there are 2 boys between V and Q (V _ _ Q). Since Q is closer to the right end than V, its rank from the right end will be smaller. So, Q's position from the right = 18 - 3 = 15th.

  3. Calculate the total number of boys: Total boys = (Position from left) + (Position from right) - 1 Total boys = 27 + 15 - 1 = 42 - 1 = 41.

Therefore, there are 41 boys in the row.

The final answer is B) 41.

Logical Reasoning: A is 16th from the left end in a row or boys and V is 18th from the right end. Q is 11th from A towards the right and 3r
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