When Mr Charlie is 36 years old, his niece is 10 years old. In how many years will he be 3 times as old as his niece?
| |
Mr Charlie |
His niece |
Difference |
| Before |
36 |
10 |
26 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mr Charlie and his niece at first and in the end remains the same.
Difference in the age between Mr Charlie and his niece
= 3 u - 1 u
= 2 u
2 u = 36 - 10
2 u = 26
1 u = 26 ÷ 2 = 13
Number of years' time so Mr Charlie will be 3 times as old as his niece
= 13 - 10
= 3
Answer(s): 3
