Daniel is 3 years old. His father is 45 years older than him. In how many years will Daniel's father be 4 times as old as Daniel?
| |
His father |
Daniel |
Difference |
| Before |
48 |
3 |
45 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Daniel and his father at first and in the end remains the same.
Difference in the age between Daniel and his father
= 4 u - 1 u
= 3 u
3 u = 45
1 u = 45 ÷ 3 = 15
The increase in age of Daniel and his father remains the same.
Number of years' time so Daniel's father will be 4 times as old as Daniel
= 15 - 3
= 12
Answer(s): 12
