When Mr Tom is 41 years old, his niece is 3 years old. In how many years will he be 3 times as old as his niece?
| |
Mr Tom |
His niece |
Difference |
| Before |
41 |
3 |
38 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mr Tom and his niece at first and in the end remains the same.
Difference in the age between Mr Tom and his niece
= 3 u - 1 u
= 2 u
2 u = 41 - 3
2 u = 38
1 u = 38 ÷ 2 = 19
Number of years' time so Mr Tom will be 3 times as old as his niece
= 19 - 3
= 16
Answer(s): 16
