Perry is 3 years old. His father is 30 years older than him. In how many years will Perry's father be 6 times as old as Perry?
| |
His father |
Perry |
Difference |
| Before |
33 |
3 |
30 |
| Change |
+ ? |
+ ? |
|
| After |
6 u |
1 u |
5 u |
The difference in the age between Perry and his father at first and in the end remains the same.
Difference in the age between Perry and his father
= 6 u - 1 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
The increase in age of Perry and his father remains the same.
Number of years' time so Perry's father will be 6 times as old as Perry
= 6 - 3
= 3
Answer(s): 3
