The ratio of Perry's to Japheth's money is 3 : 8. The ratio of Japheth's to Ahmad's money is 4 : 5. If Perry has $30, how much less does Japheth have than Ahmad?
| Perry |
Japheth |
Ahmad |
| 3x1 |
8x1 |
|
| |
4x2 |
5x2 |
| 3 u |
8 u |
10 u |
The amount that Japheth has is the repeated identity.
Use LCM to make it the same.
LCM of 8 and 4 = 8
Amount that Perry has = 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Amount that Japheth has less than Ahmad
= 10 u - 8 u
= 2 u
= 2 x 10
= $20
Answer(s): $20
