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In a row of boys, if A who is 10th from the left and B who is 9th from the right interchange their positions, A becomes 15th from left. How many boys are there in the row?

Q: In a row of boys, if A who is 10th from the left and B who is 9th from the right interchange their positions, A becomes 15th from left. How many boys are there in the row?

According to question B is 9th from the right end and A is 15th from the left end. Therefore, Total number of boys in the row = B's position in row + A's position in row - 1 Total number of boys in the row = 9 + 15 – 1 = 23

Correct Answer: 23

Explanation:

According to question B is 9th from the right end and A is 15th from the left end.
Therefore, Total number of boys in the row = B's position in row + A's position in row - 1
Total number of boys in the row = 9 + 15 – 1 = 23

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