Civil Service Exam Reviewer · Ratio and Proportion · easy

A class has 27 pupils, 18 of whom are boys. What is the ratio of boys to girls?

1. 2 : 1
2. 1 : 2
3. 2 : 3
4. 18 : 27

Answer

A. 2 : 1

Solution

Girls = 27 − 18 = 9. Boys : girls = 18 : 9 = 2 : 1.

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