When Mr Ivan is 23 years old, his niece is 3 years old. In how many years will he be 5 times as old as his niece?
| |
Mr Ivan |
His niece |
Difference |
| Before |
23 |
3 |
20 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Mr Ivan and his niece at first and in the end remains the same.
Difference in the age between Mr Ivan and his niece
= 5 u - 1 u
= 4 u
4 u = 23 - 3
4 u = 20
1 u = 20 ÷ 4 = 5
Number of years' time so Mr Ivan will be 5 times as old as his niece
= 5 - 3
= 2
Answer(s): 2
