The ratio of Adam's money to Bryan's money is 6 : 3.
The ratio of Bryan's money to Charlie's money is 7 : 4.
The total amount that they have is $300.
How much less money does Charlie have than Adam?
Adam |
Bryan |
Charlie |
6 x 7 |
3 x 7 |
|
|
7 x 3 |
4 x 3 |
42 u |
21 u |
12 u |
Amount that Bryan has is the repeated identity.
Make the amount that Bryan has the same using the LCM of 3 and 7.
LCM of 3 and 7 = 21
Adam : Bryan : Charlie
42 : 21 : 12
Total amount that Adam, Bryan and Charlie have
= 42 u + 21 u + 12 u
= 75 u
75 u = 300
1 u = 300 ÷ 75 = 4
Amount that Charlie has less than Adam
= 42 u - 12 u
= 30 u
= 30 x 4
= $120
Answer(s): $120