The ratio of Ivan's to Owen's money is 3 : 10. The ratio of Owen's to Bobby's money is 4 : 5. If Ivan has $84, how much more does Bobby have than Owen?
| Ivan |
Owen |
Bobby |
| 3x2 |
10x2 |
|
| |
4x5 |
5x5 |
| 6 u |
20 u |
25 u |
The amount that Owen has is the repeated identity.
Use LCM to make it the same.
LCM of 10 and 4 = 20
Amount that Ivan has = 6 u
6 u = 84
1 u = 84 ÷ 6 = 14
Amount that Bobby has more than Owen
= 25 u - 20 u
= 5 u
= 5 x 14
= $70
Answer(s): $70
