The ratio of Sam's to Simon's money is 4 : 5. The ratio of Simon's to Cody's money is 4 : 5. If Sam has $320, how much less does Simon have than Cody?
| Sam |
Simon |
Cody |
| 4x4 |
5x4 |
|
| |
4x5 |
5x5 |
| 16 u |
20 u |
25 u |
The amount that Simon has is the repeated identity.
Use LCM to make it the same.
LCM of 5 and 4 = 20
Amount that Sam has = 16 u
16 u = 320
1 u = 320 ÷ 16 = 20
Amount that Simon has less than Cody
= 25 u - 20 u
= 5 u
= 5 x 20
= $100
Answer(s): $100
