When Mr Charlie is 46 years old, his son is 6 years old. In how many years will he be 3 times as old as his son?
|
Mr Charlie |
His son |
Difference |
Before |
46 |
6 |
40 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
The difference in the age between Mr Charlie and his son at first and in the end remains the same.
Difference in the age between Mr Charlie and his son
= 3 u - 1 u
= 2 u
2 u = 46 - 6
2 u = 40
1 u = 40 ÷ 2 = 20
Number of years' time so Mr Charlie will be 3 times as old as his son
= 20 - 6
= 14
Answer(s): 14