Number of matinee tickets = 900
Number of student tickets = 1800
Number of regular tickets = 5800
Let x be the number of matinee tickets.
In that case, the number of student tickets is 2x.
The number of regular tickets is (8500-x-2x) = (8500-3x).
Total money
5x + 6*(2x) + 8.50*(8500-3x) = 64600
Simplifying and solving for x
5x + 12x - 8.50*3*x + 8.50*8500 = 64600
5x + 12x - 8.50*3*x = 64600 - 8.50*8500
Solving x , we get
x = 900
Number of matinee tickets = 900
Number of student tickets = 1800
Number of regular tickets = 8500 - (900+1800) = 5800
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