The ratio of Lee's to John's money is 7 : 6. The ratio of John's to Cody's money is 3 : 4. If Lee has $77, how much less does John have than Cody?
| Lee |
John |
Cody |
| 7x1 |
6x1 |
|
| |
3x2 |
4x2 |
| 7 u |
6 u |
8 u |
The amount that John has is the repeated identity.
Use LCM to make it the same.
LCM of 6 and 3 = 6
Amount that Lee has = 7 u
7 u = 77
1 u = 77 ÷ 7 = 11
Amount that John has less than Cody
= 8 u - 6 u
= 2 u
= 2 x 11
= $22
Answer(s): $22
