Min will be 82 years old in 16 years' time. Now, Kylie's age is 56 of Min's age. What was Kylie's age when she was 3 years less than 80% of Min's age?
| |
Kylie |
Min |
Difference |
| Before |
4 p - 3 |
5 p |
1 p + 3 |
| Change 1 |
+ ? |
+ ? |
|
| After 1 (Now) |
5 u |
6 u |
1 u |
| Change 2 |
+ 16 |
+ 16 |
|
| After |
5 u + 16 |
82 |
|
Min's age in 16 years' time = 6 u + 16
6 u + 16 = 82
6 u = 82 - 16
6 u = 66
1 u = 66 ÷ 6 = 11
Difference between Min's age and Kylie's age
= 1 u
= 11
80% =
80100 =
45 Difference in Min's age and Kylie's age at first
= 5 p - (4 p - 3)
= 1 p + 3
The difference in age between Min and Kylie remains unchanged.
1 p + 3 = 11
1 p = 11 - 3 = 8
Kylie's age when she was 3 years less than 80% of Min's age
= 4 p - 3
= 4 x 8 - 3
= 32 - 3
= 29
Answer(s): 29
