



 
Cori, Are you sure you have correctly reproduced this problem? Suppose the number of red balls is r, the number of blue balls is b and the number of green balls is g. Then from the problem you know the following.
Substituting the second two facts into the first equation I get
Multiply both sides by 2 to eliminate the fraction
thus
Thus the number of red balls is a fraction which is impossible. Penny  


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