The ratio of Jeremy's to Cody's money is 6 : 7. The ratio of Cody's to David's money is 4 : 5. If Jeremy has $288, how much less does Cody have than David?
Jeremy |
Cody |
David |
6x4 |
7x4 |
|
|
4x7 |
5x7 |
24 u |
28 u |
35 u |
The amount that Cody has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 4 = 28
Amount that Jeremy has = 24 u
24 u = 288
1 u = 288 ÷ 24 = 12
Amount that Cody has less than David
= 35 u - 28 u
= 7 u
= 7 x 12
= $84
Answer(s): $84