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The ratio of the ages of A and B is 3:4. Five years later, the ratio becomes 4:5. What is B's present age?

A. 20

B. 25

C. 15

D. 18

Explanation:

Let A = 3x, B = 4x. (3x+5):(4x+5)=4:5 yields x = 5, so B = 20.