Question

# If $$\dfrac{4}{7}$$ students of a class of strength $$70$$ are boys, then the number of girls equals ____.

A
40
B
30
C
20
D
50

Solution

## The correct option is B $$30$$Total strength of class $$= 70$$Fraction of students who are boys $$= \dfrac{4}{7}$$$$\Rightarrow$$ Fraction of students who are girls $$= 1 - \dfrac{4}{7} = \dfrac{3}{7}$$$$\Rightarrow$$ Total number of girls in class $$= \dfrac{3}{7}\times{70} = 30$$Mathematics

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