When Mr Nick is 40 years old, his child is 4 years old. In how many years will he be 5 times as old as his child?
| |
Mr Nick |
His child |
Difference |
| Before |
40 |
4 |
36 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Mr Nick and his child at first and in the end remains the same.
Difference in the age between Mr Nick and his child
= 5 u - 1 u
= 4 u
4 u = 40 - 4
4 u = 36
1 u = 36 ÷ 4 = 9
Number of years' time so Mr Nick will be 5 times as old as his child
= 9 - 4
= 5
Answer(s): 5
