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A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time . Hence the father's present age is --

A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time . Hence the father's present age is -- Correct Answer 45

Let the present age of the father and his son be F and S respectively. Now, F = 3S Again, F + 15 = 2(S + 15) or,  3S + 15 = 2S + 30 or, 3S - 2S = 30 - 15 or, S = 15 So,  F = 3S = 3 × 15 =  45 years

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