The ratio of Ahmad's to Ryan's money is 3 : 5. The ratio of Ryan's to Julian's money is 4 : 5. If Ahmad has $180, how much less does Ryan have than Julian?
| Ahmad |
Ryan |
Julian |
| 3x4 |
5x4 |
|
| |
4x5 |
5x5 |
| 12 u |
20 u |
25 u |
The amount that Ryan has is the repeated identity.
Use LCM to make it the same.
LCM of 5 and 4 = 20
Amount that Ahmad has = 12 u
12 u = 180
1 u = 180 ÷ 12 = 15
Amount that Ryan has less than Julian
= 25 u - 20 u
= 5 u
= 5 x 15
= $75
Answer(s): $75
