The ratio of Peter's to John's money is 3 : 7. The ratio of John's to Zeph's money is 3 : 5. If Peter has $99, how much less does John have than Zeph?
| Peter |
John |
Zeph |
| 3x3 |
7x3 |
|
| |
3x7 |
5x7 |
| 9 u |
21 u |
35 u |
The amount that John has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that Peter has = 9 u
9 u = 99
1 u = 99 ÷ 9 = 11
Amount that John has less than Zeph
= 35 u - 21 u
= 14 u
= 14 x 11
= $154
Answer(s): $154
