Question

The number of students in class A is 25% more than the number of students in class B and the number of students in C is 20% more than the number of students in class
A. If the ratio of then number of boys and girls in class A, B and C is 3: 2, 13: 7 and 12: 13 respectively, then the total number of girls in all the classes together is approximately what percent of the total number of students in all the classes together?

A 43.5%
B 47.5%
C 53.22%
D 22.5%
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