When Mr Warren is 45 years old, his cousin is 5 years old. In how many years will he be 5 times as old as his cousin?
|
Mr Warren |
His cousin |
Difference |
Before |
45 |
5 |
40 |
Change |
+ ? |
+ ? |
|
After |
5 u |
1 u |
4 u |
The difference in the age between Mr Warren and his cousin at first and in the end remains the same.
Difference in the age between Mr Warren and his cousin
= 5 u - 1 u
= 4 u
4 u = 45 - 5
4 u = 40
1 u = 40 ÷ 4 = 10
Number of years' time so Mr Warren will be 5 times as old as his cousin
= 10 - 5
= 5
Answer(s): 5