CSATRatio, Mixture & AveragesRatio & Proportion2016

In a class, there are 18 very tall boys. If these constitute three-fourths of the boys and the total number of boys is two-thirds of the total number of students in the class, what is the number of girls in the class?

A

6

B

12

C

18

D

21

Correct Answer: Option B

Explanation

Let's solve this simply, step-by-step. This is a classic CSAT question type where you work backwards from a pa

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