When Mr Fabian is 48 years old, his son is 8 years old. In how many years will he be 5 times as old as his son?
| |
Mr Fabian |
His son |
Difference |
| Before |
48 |
8 |
40 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Mr Fabian and his son at first and in the end remains the same.
Difference in the age between Mr Fabian and his son
= 5 u - 1 u
= 4 u
4 u = 48 - 8
4 u = 40
1 u = 40 ÷ 4 = 10
Number of years' time so Mr Fabian will be 5 times as old as his son
= 10 - 8
= 2
Answer(s): 2
