The ratio of John's to Luis's money is 6 : 7. The ratio of Luis's to Rael's money is 3 : 5. If John has $216, how much more does Rael have than Luis?
John |
Luis |
Rael |
6x3 |
7x3 |
|
|
3x7 |
5x7 |
18 u |
21 u |
35 u |
The amount that Luis has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that John has = 18 u
18 u = 216
1 u = 216 ÷ 18 = 12
Amount that Rael has more than Luis
= 35 u - 21 u
= 14 u
= 14 x 12
= $168
Answer(s): $168