In class A the ratio of boys to girls is 2 3 In class B the ratio of boys to girls is 4 5 If the rat...........

Quant (SSC) Ratio, Proportion

In class A, the ratio of boys to girls is 2 : 3. In class B the ratio of boys to girls is 4 : 5. If the ratio of boys to girls in both classes put together is 3 : 4, what is the ratio of number of girls in class A to number of girls in class B?

3:5

5:3

8:3

7:3

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Explanation:

Let us assume class A has 2x boys and 3x girls, class B has 4y boys and 5y girls.
2x + 4y /3x + 5y = 3/4
8x + 16y = 9x + 15y
x = y
Required ratio = 3x/5y(since x = y)
= 3/5

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