The ratio of Lee's to Bobby's money is 3 : 10. The ratio of Bobby's to Tommy's money is 4 : 5. If Lee has $66, how much less does Bobby have than Tommy?
| Lee |
Bobby |
Tommy |
| 3x2 |
10x2 |
|
| |
4x5 |
5x5 |
| 6 u |
20 u |
25 u |
The amount that Bobby has is the repeated identity.
Use LCM to make it the same.
LCM of 10 and 4 = 20
Amount that Lee has = 6 u
6 u = 66
1 u = 66 ÷ 6 = 11
Amount that Bobby has less than Tommy
= 25 u - 20 u
= 5 u
= 5 x 11
= $55
Answer(s): $55
