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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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answer is C.

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Detailed Solution

B = G + 15

B : G = 7 : 4

$\frac{G + 15}{G} = \frac{7}{4}, 4 G + 60 = 7 G, 3 G = 60, G = 20$

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