Question

1.7. In a Maths class, the girl to boy ratio is 7:5.

If there are 20 boys, how many girls are in the class?
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Answer 1

28 girls

Explanation:

Let total students be ‘X’

No of girls = (X-20)

Girls/Boys=7/5=(X-20)/20

7(20) =5(X-20)

140=5X-100

5X=240

X = 240/5

X =48

So, Total Students are 48

No of girls = (X-20) = 48-20 = 28