The ratio of Glen's to Ethan's money is 7 : 3. The ratio of Ethan's to Dylan's money is 3 : 5. If Glen has $140, how much less does Ethan have than Dylan?
| Glen |
Ethan |
Dylan |
| 7x1 |
3x1 |
|
| |
3x1 |
5x1 |
| 7 u |
3 u |
5 u |
The amount that Ethan has is the repeated identity.
Use LCM to make it the same.
LCM of 3 and 3 = 3
Amount that Glen has = 7 u
7 u = 140
1 u = 140 ÷ 7 = 20
Amount that Ethan has less than Dylan
= 5 u - 3 u
= 2 u
= 2 x 20
= $40
Answer(s): $40
