The ratio of Jack's to Eric's money is 7 : 8. The ratio of Eric's to Bobby's money is 4 : 5. If Jack has $133, how much more does Bobby have than Eric?
Jack |
Eric |
Bobby |
7x1 |
8x1 |
|
|
4x2 |
5x2 |
7 u |
8 u |
10 u |
The amount that Eric has is the repeated identity.
Use LCM to make it the same.
LCM of 8 and 4 = 8
Amount that Jack has = 7 u
7 u = 133
1 u = 133 ÷ 7 = 19
Amount that Bobby has more than Eric
= 10 u - 8 u
= 2 u
= 2 x 19
= $38
Answer(s): $38