Question

The sum of the ages of Mr and Mrs Smith and their children is 100. in 5 years time it's 130. how many children do they have

Answer 1

They have 5 children total.

Answer 2

Mr Smith + Mrs Smith + children = 100.

Members (x) = (130 - 100) / 5
x = 30/5
x = 6

Children = x - 2 (parents).
Children = 6 - 2
Children = 4