In a class of $60$ students $45 %$ are girls. Find the number of boys in the class.

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Solution

Total student $= 60$
$%$ of girls $= 45 %$
No. of boy $=$ ?
No. of girls $= 60 \times \frac{45}{100} = \frac{6 \times 45}{10} = 27$ girls
No. of boys = Total students - No. of girls $= 60 - 27 = 33$ boys

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