When Mr Oliver is 36 years old, his child is 3 years old. In how many years will he be 4 times as old as his child?
|
Mr Oliver |
His child |
Difference |
Before |
36 |
3 |
33 |
Change |
+ ? |
+ ? |
|
After |
4 u |
1 u |
3 u |
The difference in the age between Mr Oliver and his child at first and in the end remains the same.
Difference in the age between Mr Oliver and his child
= 4 u - 1 u
= 3 u
3 u = 36 - 3
3 u = 33
1 u = 33 ÷ 3 = 11
Number of years' time so Mr Oliver will be 4 times as old as his child
= 11 - 3
= 8
Answer(s): 8