The ratio of Japheth's to Bobby's money is 5 : 9. The ratio of Bobby's to Charlie's money is 4 : 5. If Japheth has $400, how much more does Charlie have than Bobby?
Japheth |
Bobby |
Charlie |
5x4 |
9x4 |
|
|
4x9 |
5x9 |
20 u |
36 u |
45 u |
The amount that Bobby has is the repeated identity.
Use LCM to make it the same.
LCM of 9 and 4 = 36
Amount that Japheth has = 20 u
20 u = 400
1 u = 400 ÷ 20 = 20
Amount that Charlie has more than Bobby
= 45 u - 36 u
= 9 u
= 9 x 20
= $180
Answer(s): $180