The ratio of Fred's to Cole's money is 7 : 8. The ratio of Cole's to Bryan's money is 3 : 5. If Fred has $420, how much more does Bryan have than Cole?
Fred |
Cole |
Bryan |
7x3 |
8x3 |
|
|
3x8 |
5x8 |
21 u |
24 u |
40 u |
The amount that Cole has is the repeated identity.
Use LCM to make it the same.
LCM of 8 and 3 = 24
Amount that Fred has = 21 u
21 u = 420
1 u = 420 ÷ 21 = 20
Amount that Bryan has more than Cole
= 40 u - 24 u
= 16 u
= 16 x 20
= $320
Answer(s): $320