Mrs Neo is 33 years old and her niece is 7 years old now. In how many years' time will Mrs Neo be thrice as old as her niece?
| |
Mrs Neo |
Her niece |
Difference |
| Before |
33 |
7 |
26 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Neo and her niece 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 Neo will be thrice as old as her niece
= 1 u - 7
= 13 - 7
= 6
Answer(s): 6
