Question 920493: A,B,C and D are four bus companies. These companies sold a total of 6000 tickets. Company A sold twice as many tickets as company B. Company C sold half as many tickets as company B. Company D sold thrice as many tickets as Company C.
How many tickets did company A, B, C and D each sell?
Answer by richwmiller(17219)   (Show Source):
You can put this solution on YOUR website! a+b+c+d=6000,
a=2b,
c=b/2,
d=3c
a+b+c+d=6000,
a-2b=0
b/2-c=0,
3c-d=0
1,1,1,1,6000
1,-2,0,0,0
0,.5,-1,0,0
0,0,3,-1,0
(2400,1200,600,1800)
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