Mr Aw is 4 times as old as his daughter who is 9 years old now. In how many years’ time will Mr Aw be twice as old as his daughter?

Question

1. from what I know..age difference will always be the same..so um help

Answer 1

So, the dad must be 9(4) = 36, right?

 

Let y = the number of years. In that number of years, the dad will be twice the age of his daughter.

 

36 + y = 2(9 + y)

36 + y = 18 + 2y

y = 18 years

 

Let's check.

 

9 + 18 = 27

36 + 18 = 54

54 = 2(27)

54 = 54

0 = 0

 

Yep, in 18 years, he will be twice his daughter's age!