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The ratio of the present ages of A and B is 4:5. Five years ago the ratio of their ages was 3:4. Find the present age of A.

Competition practiceRatio, Proportion & Mixtures

A24
B20
C15
D25

Step-by-Step Solution

Let ages be

4 x

and

5 x

. Five years ago:

(4 x - 5) / (5 x - 5) = 3/4

, which gives

x = 5

. So

A = 4 \times 5 = 20

years.

Answer: B) 20

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