There are 450 students in the tenth grade. Of these, 46% are boys. If 21% of the girls have already turned 16, which of the following is the number of girls in the tenth grade who are 16?

A 51

explanation

Subtract the percentage of boys from 100% to find the percentage of girls:
100% − 46% = 54%
Find 21% of 54% of 450:
0.21 × 0.54 × 450 ≈ 51

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