Discussion
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 the left. How many boys are there in the row ?
Answer: A
Correct answer: 23
After the exchange A stands where B stood, and A is then 15th from the left - so B was 15th from the left. B is also 9th from the right, so the row holds \[ 15 + 9 - 1 = \mathbf{23} \] boys.
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