The ratio of Bryan's money to Adam's money is 3 : 1.
The ratio of Adam's money to Charlie's money is 7 : 2.
The total amount that they have is $420.
How much more money does Bryan have than Charlie?
Bryan |
Adam |
Charlie |
3 x 7 |
1 x 7 |
|
|
7 x 1 |
2 x 1 |
21 u |
7 u |
2 u |
Amount that Adam has is the repeated identity.
Make the amount that Adam has the same using the LCM of 1 and 7.
LCM of 1 and 7 = 7
Bryan : Adam : Charlie
21 : 7 : 2
Total amount that Bryan, Adam and Charlie have
= 21 u + 7 u + 2 u
= 30 u
30 u = 420
1 u = 420 ÷ 30 = 14
Amount that Bryan has more than Charlie
= 21 u - 2 u
= 19 u
= 19 x 14
= $266
Answer(s): $266