The ratio of Charlie's to Sean's money is 5 : 7. The ratio of Sean's to Oscar's money is 3 : 5. If Charlie has $180, how much more does Oscar have than Sean?
| Charlie |
Sean |
Oscar |
| 5x3 |
7x3 |
|
| |
3x7 |
5x7 |
| 15 u |
21 u |
35 u |
The amount that Sean has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that Charlie has = 15 u
15 u = 180
1 u = 180 ÷ 15 = 12
Amount that Oscar has more than Sean
= 35 u - 21 u
= 14 u
= 14 x 12
= $168
Answer(s): $168
