Luis is 2 years old. His father is 36 years older than him. In how many years will Luis's father be 4 times as old as Luis?
| |
His father |
Luis |
Difference |
| Before |
38 |
2 |
36 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Luis and his father at first and in the end remains the same.
Difference in the age between Luis and his father
= 4 u - 1 u
= 3 u
3 u = 36
1 u = 36 ÷ 3 = 12
The increase in age of Luis and his father remains the same.
Number of years' time so Luis's father will be 4 times as old as Luis
= 12 - 2
= 10
Answer(s): 10
