When Mr Wesley is 42 years old, his son is 3 years old. In how many years will he be 4 times as old as his son?
|
Mr Wesley |
His son |
Difference |
Before |
42 |
3 |
39 |
Change |
+ ? |
+ ? |
|
After |
4 u |
1 u |
3 u |
The difference in the age between Mr Wesley and his son at first and in the end remains the same.
Difference in the age between Mr Wesley and his son
= 4 u - 1 u
= 3 u
3 u = 42 - 3
3 u = 39
1 u = 39 ÷ 3 = 13
Number of years' time so Mr Wesley will be 4 times as old as his son
= 13 - 3
= 10
Answer(s): 10