SOLUTION: Theater tickets are $8 for general admission and $5 for students. During one evening 240 tickets were sold, and the receipts were $1680. How many of each type of ticket was sold?

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Suppose that the number of tickets sold for general admission is x and the numbers of tickets sold for students is y. If we try to put the problems into equations,
... (1)
... (2)
Therefore you can work out the solution algebraically, such as by substitution:
x = 240 - y from equation (1), and submitting this value of x into (2) makes:





To find x, we can use (1) and submit this value of y



Therefore, 160 tickets were sold for general admission and 80 for students.
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