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An electronics store stocks VCRs, stereo systems, and television sets. They have limited storage space and can stock a total of at most 210 of these three machines. They know from past experience that they should stock twice as many VCRs as stereo systems and at least 30 television sets. If each VCR sells for $450, each stereo system sells for $2000, and each television set sells for $750, how many of each should be stocked and sold for maximum revenues?

My professor has us using this site to solve these problems: Simplex Method Tool

Here is what I have so far:

My objective function is z= 450x + 2000y + 750w

My constraints are:

x + y + w <= 210

w >= 30

The problem I am having is I am unsure as to how to incorporate the condition of there being twice as many VCRs as stereo systems. Obviously y = 1/2x. I tried to change my first inequality to 3/2x + w <= 210 (Since y = 1/2x and x = 2/2x then x + y = 3/2x) but this website calculator didn't seem to like that. Any idea where I'm going wrong here?

Thanks for the help,

Kyle