Jack is 2 years old. His auntie is 39 years older than him. In how many years will Jack's auntie be 4 times as old as Jack?
| |
His auntie |
Jack |
Difference |
| Before |
41 |
2 |
39 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Jack and his auntie at first and in the end remains the same.
Difference in the age between Jack and his auntie
= 4 u - 1 u
= 3 u
3 u = 39
1 u = 39 ÷ 3 = 13
The increase in age of Jack and his auntie remains the same.
Number of years' time so Jack's auntie will be 4 times as old as Jack
= 13 - 2
= 11
Answer(s): 11
