The ratio of George's to Ian's money is 3 : 7. The ratio of Ian's to Tommy's money is 3 : 4. If George has $135, how much less does Ian have than Tommy?
George |
Ian |
Tommy |
3x3 |
7x3 |
|
|
3x7 |
4x7 |
9 u |
21 u |
28 u |
The amount that Ian has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that George has = 9 u
9 u = 135
1 u = 135 ÷ 9 = 15
Amount that Ian has less than Tommy
= 28 u - 21 u
= 7 u
= 7 x 15
= $105
Answer(s): $105