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Problems on Ages - General Aptitude

Q1:

The sum of the present ages of a father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be:

A 12 years

B 14 years

C 18 years

D 20 years

ANS:D - 20 years

Let the present ages of son and father be x and (60 -x) years respectively. Then, (60 - x) - 6 = 5(x - 6)  54 - x = 5x - 30  6x = 84  x = 14.  Son's age after 6 years = (x+ 6) = 20 years..