Shiyun was 8 years old last year. She was 24 years younger than Jade.
- How old will her Jade be 5 years later?
- In how many years' time will Shiyun's age be 13 of Jade's age?
| |
Shiyun |
Jade |
Difference |
| Before (Last year) |
8 |
32 |
24 |
| Change 1 |
+ 1 |
+ 1 |
|
| After 1 (Now) |
9 |
33 |
24 |
| Change 2 |
+ 5 |
+ 5 |
|
| After 2 (5 years later) |
|
? |
24 |
(a)
Jade's age this year
= 8 + 24
= 32
Jade's age this year
= 32 + 1
= 33
Jade's age in 5 years' time
= 33 + 5
= 38
| |
Shiyun |
Jade |
Difference |
| Before |
9 |
33 |
24 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
3 u |
2 u |
(b)
The difference in the age between Shiyun and Jade at first and in the end remains unchanged.
Difference in the age between Shiyun and Jade
= 3 u - 1 u
= 2 u
2 u = 24
1 u = 24 ÷ 2 = 12
Number of years' time that Shiyun's age be
13 of Jade's age
= 12 - 9
= 3
Answer(s): (a) 38; (b) 3
