Exactly four years ago the Moloto family had 4 members, and their average age was 22. The

Question

Moloto’s then adopted another child. If the average age of the family today is 24, at what age
was the child adopted, given that he was adopted exactly two years ago?

Answer 1

The child was adopted at the age of 19

Answer 2

4 years ago, the average age was 22. So, now it is 26. After the adoption, since the average age now is 24, The new kid is x years old, where

26*4+x = 24*5
x = 16

So, he was 14 when adopted 2 years ago.