Mrs Seah is 36 years old and her cousin is 8 years old now. In how many years' time will Mrs Seah be thrice as old as her cousin?
| |
Mrs Seah |
Her cousin |
Difference |
| Before |
36 |
8 |
28 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Seah and her cousin remains unchanged.
Difference in their age at first
= 36 - 8
= 28
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 28
1 u = 28 ÷ 2 = 14
Number of years time that Mrs Seah will be thrice as old as her cousin
= 1 u - 8
= 14 - 8
= 6
Answer(s): 6
