Peter is 6 years old. His auntie is 16 years older than him. In how many years will Peter's auntie be 3 times as old as Peter?
| |
His auntie |
Peter |
Difference |
| Before |
22 |
6 |
16 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Peter and his auntie at first and in the end remains the same.
Difference in the age between Peter and his auntie
= 3 u - 1 u
= 2 u
2 u = 16
1 u = 16 ÷ 2 = 8
The increase in age of Peter and his auntie remains the same.
Number of years' time so Peter's auntie will be 3 times as old as Peter
= 8 - 6
= 2
Answer(s): 2
