Cole is 9 years old. His auntie is 39 years older than him. In how many years will Cole's auntie be 4 times as old as Cole?
| |
His auntie |
Cole |
Difference |
| Before |
48 |
9 |
39 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Cole and his auntie at first and in the end remains the same.
Difference in the age between Cole and his auntie
= 4 u - 1 u
= 3 u
3 u = 39
1 u = 39 ÷ 3 = 13
The increase in age of Cole and his auntie remains the same.
Number of years' time so Cole's auntie will be 4 times as old as Cole
= 13 - 9
= 4
Answer(s): 4
