The ratio of Wesley's to Flynn's money is 8 : 5. The ratio of Flynn's to Seth's money is 4 : 5. If Wesley has $640, how much less does Flynn have than Seth?
| Wesley |
Flynn |
Seth |
| 8x4 |
5x4 |
|
| |
4x5 |
5x5 |
| 32 u |
20 u |
25 u |
The amount that Flynn has is the repeated identity.
Use LCM to make it the same.
LCM of 5 and 4 = 20
Amount that Wesley has = 32 u
32 u = 640
1 u = 640 ÷ 32 = 20
Amount that Flynn has less than Seth
= 25 u - 20 u
= 5 u
= 5 x 20
= $100
Answer(s): $100
