The ratio of Andy's to Gabriel's money is 7 : 10. The ratio of Gabriel's to Charlie's money is 3 : 4. If Andy has $420, how much less does Gabriel have than Charlie?
| Andy |
Gabriel |
Charlie |
| 7x3 |
10x3 |
|
| |
3x10 |
4x10 |
| 21 u |
30 u |
40 u |
The amount that Gabriel has is the repeated identity.
Use LCM to make it the same.
LCM of 10 and 3 = 30
Amount that Andy has = 21 u
21 u = 420
1 u = 420 ÷ 21 = 20
Amount that Gabriel has less than Charlie
= 40 u - 30 u
= 10 u
= 10 x 20
= $200
Answer(s): $200
