Carl is 4 years old. His father is 34 years older than him. In how many years will Carl's father be 3 times as old as Carl?
| |
His father |
Carl |
Difference |
| Before |
38 |
4 |
34 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Carl and his father at first and in the end remains the same.
Difference in the age between Carl and his father
= 3 u - 1 u
= 2 u
2 u = 34
1 u = 34 ÷ 2 = 17
The increase in age of Carl and his father remains the same.
Number of years' time so Carl's father will be 3 times as old as Carl
= 17 - 4
= 13
Answer(s): 13
