CA Foundation P3 · Chapter 11 · Question 8 of 8
In a row of persons facing North, P is 7th from the left and Q is 10th from the right. When P and Q interchange their positions, P becomes 15th from the left. How many persons are there in the row?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 24
Explanation
After interchange, P occupies Q's original seat, so Q's original seat is 15th from the left and 10th from the right. Total = 15 + 10 − 1 = 24. Forgetting to subtract 1 gives 25, and 7 + 10 = 17 ignores the interchange information.
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