The ratio of Perry's to Oscar's money is 3 : 7. The ratio of Oscar's to Sam's money is 3 : 4. If Perry has $153, how much more does Sam have than Oscar?
Perry |
Oscar |
Sam |
3x3 |
7x3 |
|
|
3x7 |
4x7 |
9 u |
21 u |
28 u |
The amount that Oscar has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that Perry has = 9 u
9 u = 153
1 u = 153 ÷ 9 = 17
Amount that Sam has more than Oscar
= 28 u - 21 u
= 7 u
= 7 x 17
= $119
Answer(s): $119