When Mr Riordan is 33 years old, his cousin is 3 years old. In how many years will he be 6 times as old as his cousin?
| |
Mr Riordan |
His cousin |
Difference |
| Before |
33 |
3 |
30 |
| Change |
+ ? |
+ ? |
|
| After |
6 u |
1 u |
5 u |
The difference in the age between Mr Riordan and his cousin at first and in the end remains the same.
Difference in the age between Mr Riordan and his cousin
= 6 u - 1 u
= 5 u
5 u = 33 - 3
5 u = 30
1 u = 30 ÷ 5 = 6
Number of years' time so Mr Riordan will be 6 times as old as his cousin
= 6 - 3
= 3
Answer(s): 3
