Lynn was 5 years old last year. She was 24 years younger than Shiyun.
- How old will her Shiyun be 4 years later?
- In how many years' time will Lynn's age be 14 of Shiyun's age?
| |
Lynn |
Shiyun |
Difference |
| Before (Last year) |
5 |
29 |
24 |
| Change 1 |
+ 1 |
+ 1 |
|
| After 1 (Now) |
6 |
30 |
24 |
| Change 2 |
+ 4 |
+ 4 |
|
| After 2 (4 years later) |
|
? |
24 |
(a)
Shiyun's age this year
= 5 + 24
= 29
Shiyun's age this year
= 29 + 1
= 30
Shiyun's age in 4 years' time
= 30 + 4
= 34
| |
Lynn |
Shiyun |
Difference |
| Before |
6 |
30 |
24 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
4 u |
3 u |
(b)
The difference in the age between Lynn and Shiyun at first and in the end remains unchanged.
Difference in the age between Lynn and Shiyun
= 4 u - 1 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Number of years' time that Lynn's age be
14 of Shiyun's age
= 8 - 6
= 2
Answer(s): (a) 34; (b) 2
