The theater has in each row with 19 seats. Ticket to the first 10 rows is for 30 USD. In the next rows is for 15 USD. The theater was completely sold out. Revenue was 12255 USD.

How many rows are in the theater?

Correct answer:

n =  33

Step-by-step explanation:

191030+19(n10)15=12255  n=1225530101519+10=33

19•10•30 + 19•(n-10)•15 = 12255

285n = 9405

n = 33

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