Civil Service Exam Reviewer · Ratio and Proportion · easy

A class has 32 pupils, 20 of whom are boys. What is the ratio of boys to girls?

1. 3 : 5
2. 5 : 3
3. 5 : 8
4. 20 : 32

Answer

B. 5 : 3

Solution

Girls = 32 − 20 = 12. Boys : girls = 20 : 12 = 5 : 3.

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