Mrs Seah is 59 years old and her nephew is 11 years old now. In how many years' time will Mrs Seah be thrice as old as her nephew?
| |
Mrs Seah |
Her nephew |
Difference |
| Before |
59 |
11 |
48 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Seah and her nephew remains unchanged.
Difference in their age at first
= 59 - 11
= 48
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 48
1 u = 48 ÷ 2 = 24
Number of years time that Mrs Seah will be thrice as old as her nephew
= 1 u - 11
= 24 - 11
= 13
Answer(s): 13
