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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
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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