Perry is 3 years old. His mother is 45 years older than him. In how many years will Perry's mother be 6 times as old as Perry?
| |
His mother |
Perry |
Difference |
| Before |
48 |
3 |
45 |
| Change |
+ ? |
+ ? |
|
| After |
6 u |
1 u |
5 u |
The difference in the age between Perry and his mother at first and in the end remains the same.
Difference in the age between Perry and his mother
= 6 u - 1 u
= 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
The increase in age of Perry and his mother remains the same.
Number of years' time so Perry's mother will be 6 times as old as Perry
= 9 - 3
= 6
Answer(s): 6
