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Ravi's father is 4 times as old as Ravi today. In 15 years, the father will be only 2.5 times as old as Ravi. How old is Ravi now (in years)?

Competition practiceAverages & Ages

A12
B15
C18
D10

Step-by-Step Solution

Let Ravi be

x

. Then

4 x + 15 = 2.5 (x + 15)

, so

1.5 x = 22.5

and

x = 15

(father 60; in 15 years

75 = 2.5 \times 30

).

Answer: B) 15

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