Three years ago, Ryan's age was 20% of Perry's age. Eleven years from their current age, Ryan's age will be 37.5% of Perry's age. How many years is Perry older than Ryan?
| |
Ryan |
Perry |
Difference |
| Before |
1x5 =
5 u |
5x5 =
25 u |
4x5 =
20 u |
| Change |
+ 3
+ 11 |
+ 3
+ 11 |
|
| After |
3x4 =
12 u |
8x4 =
32 u |
5x4 =
20 u |
20% =
20100 =
15 37.5% =
3751000 =
38The difference in the ages between Ryan and Perry remains unchanged. Make the difference the same. LCM of 4 and 5 is 20.
Increase in Ryan's age
= 12 u - 5 u
= 7 u
7 u = 3 + 11
7 u = 14
1 u = 14 ÷ 7 = 2
Number of years that Perry is older than Ryan
= 25 u - 5 u
= 20 u
= 20 x 2
= 40
Answer(s): 40
