Question

A father was 3 times as old as his son in 1980 A.D.and 5/3 times as old in 2008 A.D.In which year was the son born?

Answer 1

Let s be the son, and 3s be the father, in 1980. Then:

2008–1980=28 years

So:

5/3(s+28)=3s+28

5s/3+140/3=3s+28

5s+140=9s+84

4s=56

s=14

If the son was 14 in the year 1980, then he was born in 1966 ……………

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