Winnie was 12 years old last year. She was 28 years younger than Zoe.
- How old will her Zoe be 6 years later?
- In how many years' time will Winnie's age be 13 of Zoe's age?
| |
Winnie |
Zoe |
Difference |
| Before (Last year) |
12 |
40 |
28 |
| Change 1 |
+ 1 |
+ 1 |
|
| After 1 (Now) |
13 |
41 |
28 |
| Change 2 |
+ 6 |
+ 6 |
|
| After 2 (6 years later) |
|
? |
28 |
(a)
Zoe's age this year
= 12 + 28
= 40
Zoe's age this year
= 40 + 1
= 41
Zoe's age in 6 years' time
= 41 + 6
= 47
| |
Winnie |
Zoe |
Difference |
| Before |
13 |
41 |
28 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
3 u |
2 u |
(b)
The difference in the age between Winnie and Zoe at first and in the end remains unchanged.
Difference in the age between Winnie and Zoe
= 3 u - 1 u
= 2 u
2 u = 28
1 u = 28 ÷ 2 = 14
Number of years' time that Winnie's age be
13 of Zoe's age
= 14 - 13
= 1
Answer(s): (a) 47; (b) 1
