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Q.

The ratio of boys to girls in a class is 7 : 4. The class has 15 more boys than girls How many girls are there in the class?

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a

16

b

40

c

20

d

30

answer is C.

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Detailed Solution

B = G + 15

B : G = 7 : 4

G+15G = 74,  4G + 60 = 7G,  3G = 60, G = 20 

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