Fred is 5 years old. His auntie is 42 years older than him. In how many years will Fred's auntie be 4 times as old as Fred?
| |
His auntie |
Fred |
Difference |
| Before |
47 |
5 |
42 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Fred and his auntie at first and in the end remains the same.
Difference in the age between Fred and his auntie
= 4 u - 1 u
= 3 u
3 u = 42
1 u = 42 ÷ 3 = 14
The increase in age of Fred and his auntie remains the same.
Number of years' time so Fred's auntie will be 4 times as old as Fred
= 14 - 5
= 9
Answer(s): 9
