In a row of boys, A is tenth from the left and B is ninth from the right end. Now if they interchange their positions, A becomes fifteenth from left. The total number of boys in the row is

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In a row of boys, A is tenth from the left and B is ninth from the right end. Now if
they interchange their positions, A becomes fifteenth from left. The total number of
boys in the row is

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answer is A.

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Detailed Solution

Question Image A is 10th from the left end and B is 9th from the right end. Also, if they interchange their position then A becomes 15th from the left end, which implies 14 people must be sitting to the left of A including B. Hence, 4 people are sitting between A and B as shown above:
Total number of boys in the row = 9 + 4 + 8 + A + B = 23 boys

Hence, 23 boys are there in the row.

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