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The ratio of the present ages of A and B is 4:5. After 6 years the ratio becomes 6:7. What is the present age of A? (answer in years)

Competition practiceRatio, Proportion & Mixtures

A12
B10
C15
D18

Step-by-Step Solution

Let ages

4 x

and

5 x . (4 x + 6) / (5 x + 6) = 6/7

→

28 x + 42 = 30 x + 36

→

2 x = 6

→

x = 3

;

A = 4 \times 3 = 12

.

Answer: A) 12

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