Question

How to find number of boys and girls in school D ?​

Answer 1

$5:4=5x:4x$

Let's say No. of boys $5x$ and girls $4x$.

(total collection) = (boys' fee + girls' fee)

$700\times 5x + 500\times 4x=220000$

$3500x+2000x=220000$

$x=\frac{220000}{5500} =40$

Number of boys : 200

Number of girls : 160