The ratio of Ahmad's to Luke's money is 4 : 7. The ratio of Luke's to George's money is 3 : 4. If Ahmad has $156, how much more does George have than Luke?
Ahmad |
Luke |
George |
4x3 |
7x3 |
|
|
3x7 |
4x7 |
12 u |
21 u |
28 u |
The amount that Luke has is the repeated identity.
Use LCM to make it the same.
LCM of 7 and 3 = 21
Amount that Ahmad has = 12 u
12 u = 156
1 u = 156 ÷ 12 = 13
Amount that George has more than Luke
= 28 u - 21 u
= 7 u
= 7 x 13
= $91
Answer(s): $91