When Mr Oliver is 30 years old, his daughter is 2 years old. In how many years will he be 5 times as old as his daughter?
| |
Mr Oliver |
His daughter |
Difference |
| Before |
30 |
2 |
28 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Mr Oliver and his daughter at first and in the end remains the same.
Difference in the age between Mr Oliver and his daughter
= 5 u - 1 u
= 4 u
4 u = 30 - 2
4 u = 28
1 u = 28 ÷ 4 = 7
Number of years' time so Mr Oliver will be 5 times as old as his daughter
= 7 - 2
= 5
Answer(s): 5
