In a row of boys, A is 5th from the left and B is 8th from the right. If they interchange positions, A becomes 15th from the left. How many boys are in the row?
Explanation:
A's new position from left is 15, which is B's original position from left. Total = B's left position + B's right position - 1 = 15 + 8 - 1 = 22.
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