The ratio of Daniel's to John's money is 3 : 7. The ratio of John's to Sam's money is 4 : 5. If Daniel has $144, how much less does John have than Sam?
| Daniel |
John |
Sam |
| 3x4 |
7x4 |
|
| |
4x7 |
5x7 |
| 12 u |
28 u |
35 u |
The amount that John has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 4 = 28
Amount that Daniel has = 12 u
12 u = 144
1 u = 144 ÷ 12 = 12
Amount that John has less than Sam
= 35 u - 28 u
= 7 u
= 7 x 12
= $84
Answer(s): $84
