When Mr Luke is 50 years old, his son is 2 years old. In how many years will he be 5 times as old as his son?
|
Mr Luke |
His son |
Difference |
Before |
50 |
2 |
48 |
Change |
+ ? |
+ ? |
|
After |
5 u |
1 u |
4 u |
The difference in the age between Mr Luke and his son at first and in the end remains the same.
Difference in the age between Mr Luke and his son
= 5 u - 1 u
= 4 u
4 u = 50 - 2
4 u = 48
1 u = 48 ÷ 4 = 12
Number of years' time so Mr Luke will be 5 times as old as his son
= 12 - 2
= 10
Answer(s): 10