The ratio of Julian's to Rael's money is 7 : 9. The ratio of Rael's to Archie's money is 3 : 4. If Julian has $77, how much more does Archie have than Rael?
| Julian |
Rael |
Archie |
| 7x1 |
9x1 |
|
| |
3x3 |
4x3 |
| 7 u |
9 u |
12 u |
The amount that Rael has is the repeated identity.
Use LCM to make it the same.
LCM of 9 and 3 = 9
Amount that Julian has = 7 u
7 u = 77
1 u = 77 ÷ 7 = 11
Amount that Archie has more than Rael
= 12 u - 9 u
= 3 u
= 3 x 11
= $33
Answer(s): $33
