The ratio of Bryan's money to Charlie's money is 7 : 3.
The ratio of Charlie's money to Adam's money is 9 : 3.
The total amount that they have is $231.
How much less money does Adam have than Bryan?
Bryan |
Charlie |
Adam |
7 x 3 |
3 x 3 |
|
|
9 x 1 |
3 x 1 |
21 u |
9 u |
3 u |
Amount that Charlie has is the repeated identity.
Make the amount that Charlie has the same using the LCM of 3 and 9.
LCM of 3 and 9 = 9
Bryan : Charlie : Adam
21 : 9 : 3
Total amount that Bryan, Charlie and Adam have
= 21 u + 9 u + 3 u
= 33 u
33 u = 231
1 u = 231 ÷ 33 = 7
Amount that Adam has less than Bryan
= 21 u - 3 u
= 18 u
= 18 x 7
= $126
Answer(s): $126