The ratio of Andy's to Liam's money is 8 : 9. The ratio of Liam's to Archie's money is 4 : 5. If Andy has $608, how much less does Liam have than Archie?
| Andy |
Liam |
Archie |
| 8x4 |
9x4 |
|
| |
4x9 |
5x9 |
| 32 u |
36 u |
45 u |
The amount that Liam has is the repeated identity.
Use LCM to make it the same.
LCM of 9 and 4 = 36
Amount that Andy has = 32 u
32 u = 608
1 u = 608 ÷ 32 = 19
Amount that Liam has less than Archie
= 45 u - 36 u
= 9 u
= 9 x 19
= $171
Answer(s): $171
