The ratio of ages of A and B is 3:4 and the sum of their ages is 42. What is the age of A?

A15

B18

C21

D24

Explanation

3x+4x=42 => 7x=42 => x=6. A = 3*6 = 18.

Exam Relevance

Topic: Ratio and Proportion
Subtopic: Age Problems

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