The ratio of David's to Zane's money is 5 : 9. The ratio of Zane's to Rael's money is 3 : 4. If David has $85, how much more does Rael have than Zane?
| David |
Zane |
Rael |
| 5x1 |
9x1 |
|
| |
3x3 |
4x3 |
| 5 u |
9 u |
12 u |
The amount that Zane has is the repeated identity.
Use LCM to make it the same.
LCM of 9 and 3 = 9
Amount that David has = 5 u
5 u = 85
1 u = 85 ÷ 5 = 17
Amount that Rael has more than Zane
= 12 u - 9 u
= 3 u
= 3 x 17
= $51
Answer(s): $51
