Question

The ratio of boys to girls in a class is 4:5. If number of boys is 20, find the number of girls.

Answer 1

Ratio of boys : girls = 4 : 5

No. of boys = 20

Let the number of girls be x,

Then, $\frac{20}{x}=\frac{4}{5}$

$\therefore 4x=5\times 20$

$\Rightarrow x=25$

$\therefore$ Number of girls = 25