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The ratio of boys to girls in class A is 3 to 4 . The ratio of boys to girls in class B is 4 to 5 . If the two classes were combined, the ratio of boys to girls in class B is two less than the number of girls in class A. How many girls are in class A?

A. 87
B. 11
C. 12
D. 15
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সঠিক উত্তরঃ B. 11
Explanation: