60% of students in a classroom are boys. If there are 50 students in the class, how many of them are girls?

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Solution

The correct option is B 20
Percentage of boys in the classroom = 60%
Therefore percentage of girls in the classroom = 100 - 60 = 40%
Number of children in the classroom = 50
Therefore number of girls = $\frac{40}{100} \times 50$
= 20

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