Seth is 3 years old. His auntie is 40 years older than him. In how many years will Seth's auntie be 5 times as old as Seth?
| |
His auntie |
Seth |
Difference |
| Before |
43 |
3 |
40 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Seth and his auntie at first and in the end remains the same.
Difference in the age between Seth and his auntie
= 5 u - 1 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
The increase in age of Seth and his auntie remains the same.
Number of years' time so Seth's auntie will be 5 times as old as Seth
= 10 - 3
= 7
Answer(s): 7
