The ratio of Ben's to Oliver's money is 5 : 7. The ratio of Oliver's to Riordan's money is 3 : 4. If Ben has $270, how much less does Oliver have than Riordan?
Ben |
Oliver |
Riordan |
5x3 |
7x3 |
|
|
3x7 |
4x7 |
15 u |
21 u |
28 u |
The amount that Oliver has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that Ben has = 15 u
15 u = 270
1 u = 270 ÷ 15 = 18
Amount that Oliver has less than Riordan
= 28 u - 21 u
= 7 u
= 7 x 18
= $126
Answer(s): $126