The ratio of Rael's to Cole's money is 8 : 7. The ratio of Cole's to Liam's money is 4 : 5. If Rael has $640, how much less does Cole have than Liam?
Rael |
Cole |
Liam |
8x4 |
7x4 |
|
|
4x7 |
5x7 |
32 u |
28 u |
35 u |
The amount that Cole has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 4 = 28
Amount that Rael has = 32 u
32 u = 640
1 u = 640 ÷ 32 = 20
Amount that Cole has less than Liam
= 35 u - 28 u
= 7 u
= 7 x 20
= $140
Answer(s): $140