When Mr Mark is 46 years old, his nephew is 4 years old. In how many years will he be 4 times as old as his nephew?
| |
Mr Mark |
His nephew |
Difference |
| Before |
46 |
4 |
42 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Mr Mark and his nephew at first and in the end remains the same.
Difference in the age between Mr Mark and his nephew
= 4 u - 1 u
= 3 u
3 u = 46 - 4
3 u = 42
1 u = 42 ÷ 3 = 14
Number of years' time so Mr Mark will be 4 times as old as his nephew
= 14 - 4
= 10
Answer(s): 10
