Mrs Chan is 33 years old and her nephew is 7 years old now. In how many years' time will Mrs Chan be thrice as old as her nephew?
| |
Mrs Chan |
Her nephew |
Difference |
| Before |
33 |
7 |
26 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Chan and her nephew remains unchanged.
Difference in their age at first
= 33 - 7
= 26
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 26
1 u = 26 ÷ 2 = 13
Number of years time that Mrs Chan will be thrice as old as her nephew
= 1 u - 7
= 13 - 7
= 6
Answer(s): 6
