Let x = number of main floor tickets sold
Let y = number of balcony tickets sold
x + y = total tickets sold
7.50x + 5y = total revenue
x + y = 250
7.50x + 5y = 3250
Substitute x + y = 250 into 7.50x + 5y = 3250
7.50(250) + 5y = 3250
1875 + 5y = 3250
Subtract 1875 from both sides
5y = 1375
Divide both sides by 5
y = 275
Substitute y = 275 into x + y = 250
x + 275 = 250
x = -25
Since x cannot be negative, the equation is not valid. Therefore, the number of tickets sold cannot be determined.
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