The ratio of Dylan's to Seth's money is 5 : 3. The ratio of Seth's to Ahmad's money is 4 : 5. If Dylan has $300, how much less does Seth have than Ahmad?
| Dylan |
Seth |
Ahmad |
| 5x4 |
3x4 |
|
| |
4x3 |
5x3 |
| 20 u |
12 u |
15 u |
The amount that Seth has is the repeated identity.
Use LCM to make it the same.
LCM of 3 and 4 = 12
Amount that Dylan has = 20 u
20 u = 300
1 u = 300 ÷ 20 = 15
Amount that Seth has less than Ahmad
= 15 u - 12 u
= 3 u
= 3 x 15
= $45
Answer(s): $45
