Mrs Neo is 61 years old and her daughter is 11 years old now. In how many years' time will Mrs Neo be thrice as old as her daughter?
| |
Mrs Neo |
Her daughter |
Difference |
| Before |
61 |
11 |
50 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Neo and her daughter remains unchanged.
Difference in their age at first
= 61 - 11
= 50
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 50
1 u = 50 ÷ 2 = 25
Number of years time that Mrs Neo will be thrice as old as her daughter
= 1 u - 11
= 25 - 11
= 14
Answer(s): 14
