Last Tuesday, Regal Cinemas sold a total of 8500 movie tickets. Proceeds totaled $64,600. Tickets can be bought in one of the 3 ways: a senior admission costs $5, student admission is $6, and a regular admission is $8.50. How many of each type of ticket was sold if twice as many student tickets were sold as senior tickets? write a 3 varible system of equations

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