The ratio of Oscar's to Perry's money is 7 : 3. The ratio of Perry's to Ian's money is 4 : 5. If Oscar has $504, how much less does Perry have than Ian?
| Oscar |
Perry |
Ian |
| 7x4 |
3x4 |
|
| |
4x3 |
5x3 |
| 28 u |
12 u |
15 u |
The amount that Perry has is the repeated identity.
Use LCM to make it the same.
LCM of 3 and 4 = 12
Amount that Oscar has = 28 u
28 u = 504
1 u = 504 ÷ 28 = 18
Amount that Perry has less than Ian
= 15 u - 12 u
= 3 u
= 3 x 18
= $54
Answer(s): $54
