1.

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

Answer»

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



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