saba4010 wrote:

The girl:boy ratio in class A was 1:3 and the same ratio in Class B was 2:1. When the two classes were combined, the ratio became 1:1. If class A had 24 girls, how many students did class B have?

A) 48

B) 72

C) 96

D) 120

E) 144

Class A : Girl : Boy = 1:3

No. of girls = 24

No. of boys = 24*3 = 72

Total = 24 + 72 = 96

Class B : Girl : Boy = 2:1

Let no. of girls & boys are 2x & x respectively

Total = 2x + x = 3x

Now they are mixed and the ratio is 1:1

So, 24 + 2x = 72 + x

x = 48

Also total no. of students in class B = 3x = 3 * 48 = 144

Answer E
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