Eva was 5 years old last year. She was 27 years younger than Hilda.
- How old will her Hilda be 6 years later?
- In how many years' time will Eva's age be 14 of Hilda's age?
| |
Eva |
Hilda |
Difference |
| Before (Last year) |
5 |
32 |
27 |
| Change 1 |
+ 1 |
+ 1 |
|
| After 1 (Now) |
6 |
33 |
27 |
| Change 2 |
+ 6 |
+ 6 |
|
| After 2 (6 years later) |
|
? |
27 |
(a)
Hilda's age this year
= 5 + 27
= 32
Hilda's age this year
= 32 + 1
= 33
Hilda's age in 6 years' time
= 33 + 6
= 39
| |
Eva |
Hilda |
Difference |
| Before |
6 |
33 |
27 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
4 u |
3 u |
(b)
The difference in the age between Eva and Hilda at first and in the end remains unchanged.
Difference in the age between Eva and Hilda
= 4 u - 1 u
= 3 u
3 u = 27
1 u = 27 ÷ 3 = 9
Number of years' time that Eva's age be
14 of Hilda's age
= 9 - 6
= 3
Answer(s): (a) 39; (b) 3
