Question

In a school 5 by 8 are boys and girls are 240 then how many boys there

Answer 1

X=total students
if ratio of boys =5/8
then ratio of girls =3/8
no of girls =240
3/8 of x = 240
3x/8=240
3x=1920
x=640
no of boys =640-240= 400

Answer 2

No. of boys = 5/8 of total

now,take the total no. Students as X

No. of girls = 1 - 5/8= 3/8

So, 3/8 × X(total)= 240

Means X = 640

Now, 640= 240 +no. Of boys

640-240= no. Of boys

No. Of boys = 400