The ratio of Reggie's to Mark's money is 3 : 10. The ratio of Mark's to Brandon's money is 3 : 4. If Reggie has $108, how much less does Mark have than Brandon?
| Reggie |
Mark |
Brandon |
| 3x3 |
10x3 |
|
| |
3x10 |
4x10 |
| 9 u |
30 u |
40 u |
The amount that Mark has is the repeated identity.
Use LCM to make it the same.
LCM of 10 and 3 = 30
Amount that Reggie has = 9 u
9 u = 108
1 u = 108 ÷ 9 = 12
Amount that Mark has less than Brandon
= 40 u - 30 u
= 10 u
= 10 x 12
= $120
Answer(s): $120
