A father said to his son Rohit, "I was as old as you are at the present at the time of your birth". If the father's age is fourty two years now, Rohit's age five years back was:
Let the Rohit's present age be x years. Then, (42 - x) = x
2x = 42.
x = 21
Rohit's age 5 years back (21 - 5) = 16 years.
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