The ratio of Michael's to Justin's money is 3 : 5. The ratio of Justin's to Japheth's money is 3 : 4. If Michael has $162, how much less does Justin have than Japheth?
| Michael |
Justin |
Japheth |
| 3x3 |
5x3 |
|
| |
3x5 |
4x5 |
| 9 u |
15 u |
20 u |
The amount that Justin has is the repeated identity.
Use LCM to make it the same.
LCM of 5 and 3 = 15
Amount that Michael has = 9 u
9 u = 162
1 u = 162 ÷ 9 = 18
Amount that Justin has less than Japheth
= 20 u - 15 u
= 5 u
= 5 x 18
= $90
Answer(s): $90
