The ratio of Charlie's money to Bryan's money is 9 : 3.
The ratio of Bryan's money to Adam's money is 7 : 2.
The total amount that they have is $450.
How much less money does Adam have than Charlie?
Charlie |
Bryan |
Adam |
9 x 7 |
3 x 7 |
|
|
7 x 3 |
2 x 3 |
63 u |
21 u |
6 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
Charlie : Bryan : Adam
63 : 21 : 6
Total amount that Charlie, Bryan and Adam have
= 63 u + 21 u + 6 u
= 90 u
90 u = 450
1 u = 450 ÷ 90 = 5
Amount that Adam has less than Charlie
= 63 u - 6 u
= 57 u
= 57 x 5
= $285
Answer(s): $285