Henry is 3 years old. His auntie is 24 years older than him. In how many years will Henry's auntie be 3 times as old as Henry?
| |
His auntie |
Henry |
Difference |
| Before |
27 |
3 |
24 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Henry and his auntie at first and in the end remains the same.
Difference in the age between Henry and his auntie
= 3 u - 1 u
= 2 u
2 u = 24
1 u = 24 ÷ 2 = 12
The increase in age of Henry and his auntie remains the same.
Number of years' time so Henry's auntie will be 3 times as old as Henry
= 12 - 3
= 9
Answer(s): 9
