Question 819356
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Hi,
Alan, Fred, and Mark are going to buy a computer that cost $540. 
If Alan pays $40 more than Fred and 
Fred pays twice as much as Mark, then how much{{{green(x)}}} does Mark pay?
Mark  x
Fred  2x
Alan  2x + $40
  x + 2x + (2x+$40) = $540
              5x = $500
               x = $100, the amount Mark pays