Discussion
Nita is the 11th from the either end of the row of girls, how many girls are there in the row ?
Answer: C
There are 21 girls in the row.
If Nita is 11th from the left, 10 girls stand to her left; if she is also 11th from the right, 10 girls stand to her right. Counting her once:
\[ \begin{aligned} \text{total} &= 10 + 1 + 10 \\ &= 11 + 11 - 1 = 21 \end{aligned} \]
The general rule is: position from left + position from right − 1. Answering 22 counts Nita twice, and 20 or 19 leave out girls.
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