The ratio of Cody's to Oliver's money is 4 : 5. The ratio of Oliver's to Seth's money is 3 : 5. If Cody has $120, how much more does Seth have than Oliver?
| Cody |
Oliver |
Seth |
| 4x3 |
5x3 |
|
| |
3x5 |
5x5 |
| 12 u |
15 u |
25 u |
The amount that Oliver has is the repeated identity.
Use LCM to make it the same.
LCM of 5 and 3 = 15
Amount that Cody has = 12 u
12 u = 120
1 u = 120 ÷ 12 = 10
Amount that Seth has more than Oliver
= 25 u - 15 u
= 10 u
= 10 x 10
= $100
Answer(s): $100
