Mrs Pang is 53 years old and her nephew is 7 years old now. In how many years' time will Mrs Pang be thrice as old as her nephew?
| |
Mrs Pang |
Her nephew |
Difference |
| Before |
53 |
7 |
46 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mrs Pang and her nephew remains unchanged.
Difference in their age at first
= 53 - 7
= 46
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 46
1 u = 46 ÷ 2 = 23
Number of years time that Mrs Pang will be thrice as old as her nephew
= 1 u - 7
= 23 - 7
= 16
Answer(s): 16
