
David W. answered 04/17/15
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Tutor specializing in Math, Science, and Computers.
You are going to end up with 2 formulas, which is good because you have 2 variables. The first one is based on how many tickets were sold. L is the amount of lower box tickets sold and u is the amount of upper box tickets.
L + U = 306
The next formula deals with the price.
L*12.5 + U*10 = 3340
If you solve for U in the first formula, you get:
U = 306 - L
You can put 306-L in to the second formula anywhere you see U, so you get:
L*12.5 + (306-L)*10 = 3340
Now, solve for L and you have how many lower deck tickets were sold. Plug that in to U = 306 - L and you find out how many upper deck tickets were sold.