When Mr Cole is 47 years old, his son is 2 years old. In how many years will he be 4 times as old as his son?
| |
Mr Cole |
His son |
Difference |
| Before |
47 |
2 |
45 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Mr Cole and his son at first and in the end remains the same.
Difference in the age between Mr Cole and his son
= 4 u - 1 u
= 3 u
3 u = 47 - 2
3 u = 45
1 u = 45 ÷ 3 = 15
Number of years' time so Mr Cole will be 4 times as old as his son
= 15 - 2
= 13
Answer(s): 13
