Question

answer my question it's very easy

Answer 1

Let the no. of boys be X.
Hence no. of girls wil be 3X/5
No. of boys + No. of girls = 40
X + 3X/5 = 40
8X / 5 = 40
Transposing 5 to right
8X = 200
X = 200/8 = 25
No.of girls = 3X/5 = 3×25/5 = 75/5 = 15

Answer 2

Let the no. of boys be X.

Hence no. of girls wil be 3X/5

No. of boys + No. of girls = 40

X + 3X/5 = 40

8X / 5 = 40

8X = 200

X = 200/8 = 25

No.of girls = 3X/5 = 3×25/5 = 75/5 = 15