Discussion
In a row of thirty boys, R is fourth from the right end and W is tenth from the left end . How many boys are there between R and W?
Answer: B
Correct answer: 16
R is 4th from the right of thirty, so he is \( 30-4+1 = 27 \)th from the left. Between the 10th and the 27th place there are \[ 27 - 10 - 1 = \mathbf{16} \] boys.
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