Mrs Ee is 42 years old and her daughter is 8 years old now. In how many years' time will Mrs Ee be thrice as old as her daughter?
| |
Mrs Ee |
Her daughter |
Difference |
| Before |
42 |
8 |
34 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Ee and her daughter remains unchanged.
Difference in their age at first
= 42 - 8
= 34
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 34
1 u = 34 ÷ 2 = 17
Number of years time that Mrs Ee will be thrice as old as her daughter
= 1 u - 8
= 17 - 8
= 9
Answer(s): 9
