Ivory was 9 years old last year. She was 28 years younger than Julie.
- How old will her Julie be 6 years later?
- In how many years' time will Ivory's age be 13 of Julie's age?
|
Ivory |
Julie |
Difference |
Before (Last year) |
9 |
37 |
28 |
Change 1 |
+ 1 |
+ 1 |
|
After 1 (Now) |
10 |
38 |
28 |
Change 2 |
+ 6 |
+ 6 |
|
After 2 (6 years later) |
|
? |
28 |
(a)
Julie's age this year
= 9 + 28
= 37
Julie's age this year
= 37 + 1
= 38
Julie's age in 6 years' time
= 38 + 6
= 44
|
Ivory |
Julie |
Difference |
Before |
10 |
38 |
28 |
Change |
+ ? |
+ ? |
|
After |
1 u |
3 u |
2 u |
(b)
The difference in the age between Ivory and Julie at first and in the end remains unchanged.
Difference in the age between Ivory and Julie
= 3 u - 1 u
= 2 u
2 u = 28
1 u = 28 ÷ 2 = 14
Number of years' time that Ivory's age be
13 of Julie's age
= 14 - 10
= 4
Answer(s): (a) 44; (b) 4