Question

A mother is 30 years old her daughter 4 years. In how many years the age of the mother will triple the one of her daughter?​

Answer 1

Resposta:

30 + x = 3 ( 4 +x)

30 +x = 12 + 3x

30 - 12 = 3x - x

18 = 2x

x = 18/2

x = 9 years.