A father is now three times as old as his son. Five years back, he was four times as old as his son. The present age of the son(in years) is

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Solution

Let son's present age be x yrs.

Then, father's age = 3x

5 yr ago, father's age = (3x-5) yr

So, 3x-5 = 4(x-5)

3x-5=4x-20

x=15 yrs

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