Mrs Goh is 52 years old and her nephew is 12 years old now. In how many years' time will Mrs Goh be thrice as old as her nephew?
| |
Mrs Goh |
Her nephew |
Difference |
| Before |
52 |
12 |
40 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Goh and her nephew remains unchanged.
Difference in their age at first
= 52 - 12
= 40
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Number of years time that Mrs Goh will be thrice as old as her nephew
= 1 u - 12
= 20 - 12
= 8
Answer(s): 8
