Luis is 3 years old. His auntie is 32 years older than him. In how many years will Luis's auntie be 3 times as old as Luis?
| |
His auntie |
Luis |
Difference |
| Before |
35 |
3 |
32 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Luis and his auntie at first and in the end remains the same.
Difference in the age between Luis and his auntie
= 3 u - 1 u
= 2 u
2 u = 32
1 u = 32 ÷ 2 = 16
The increase in age of Luis and his auntie remains the same.
Number of years' time so Luis's auntie will be 3 times as old as Luis
= 16 - 3
= 13
Answer(s): 13
