The ratio of Billy's to Tim's money is 7 : 4. The ratio of Tim's to Cole's money is 3 : 5. If Billy has $315, how much more does Cole have than Tim?
| Billy |
Tim |
Cole |
| 7x3 |
4x3 |
|
| |
3x4 |
5x4 |
| 21 u |
12 u |
20 u |
The amount that Tim has is the repeated identity.
Use LCM to make it the same.
LCM of 4 and 3 = 12
Amount that Billy has = 21 u
21 u = 315
1 u = 315 ÷ 21 = 15
Amount that Cole has more than Tim
= 20 u - 12 u
= 8 u
= 8 x 15
= $120
Answer(s): $120
