Busi has

Busi has a bag containing twenty balls. There are twice as many yellow balls as blue balls, but the yellow balls are only a third of the red balls. The green balls are the same number as the blue balls. How many are each color ball?

Correct answer:

y =  4
r =  12
b =  2
g =  2

Step-by-step explanation:

y=2b y=r/3 g=b y+b+r+g=20  y=2 b y=r/3 g=b y+b+r+g=20  2by=0 r3y=0 bg=0 b+g+r+y=20  Row321 Row1Row3 2by=0 r3y=0 g+0.5y=0 b+g+r+y=20  Row421 Row1Row4 2by=0 r3y=0 g+0.5y=0 g+r+1.5y=20  Pivot:Row2Row3 2by=0 g+0.5y=0 r3y=0 g+r+1.5y=20  Row4+Row2Row4 2by=0 g+0.5y=0 r3y=0 r+2y=20  Row4Row3Row4 2by=0 g+0.5y=0 r3y=0 5y=20  y=520=4 r=0+3y=0+3 4=12 g=100.5y=100.5 4=2 b=20+y=20+4=2  b=2 g=2 r=12 y=4

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