When Mr Oliver is 37 years old, his niece is 9 years old. In how many years will he be 3 times as old as his niece?
| |
Mr Oliver |
His niece |
Difference |
| Before |
37 |
9 |
28 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mr Oliver and his niece at first and in the end remains the same.
Difference in the age between Mr Oliver and his niece
= 3 u - 1 u
= 2 u
2 u = 37 - 9
2 u = 28
1 u = 28 ÷ 2 = 14
Number of years' time so Mr Oliver will be 3 times as old as his niece
= 14 - 9
= 5
Answer(s): 5
