Jenson is 7 years old. His father is 38 years older than him. In how many years will Jenson's father be 3 times as old as Jenson?
| |
His father |
Jenson |
Difference |
| Before |
45 |
7 |
38 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Jenson and his father at first and in the end remains the same.
Difference in the age between Jenson and his father
= 3 u - 1 u
= 2 u
2 u = 38
1 u = 38 ÷ 2 = 19
The increase in age of Jenson and his father remains the same.
Number of years' time so Jenson's father will be 3 times as old as Jenson
= 19 - 7
= 12
Answer(s): 12
