The ratio of Nick's to Elijah's money is 3 : 7. The ratio of Elijah's to Lee's money is 4 : 5. If Nick has $120, how much more does Lee have than Elijah?
| Nick |
Elijah |
Lee |
| 3x4 |
7x4 |
|
| |
4x7 |
5x7 |
| 12 u |
28 u |
35 u |
The amount that Elijah has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 4 = 28
Amount that Nick has = 12 u
12 u = 120
1 u = 120 ÷ 12 = 10
Amount that Lee has more than Elijah
= 35 u - 28 u
= 7 u
= 7 x 10
= $70
Answer(s): $70
