Question

The community theater in Richmond has been seeing a 10% drop in attendance every year. This year they sold 18,000 tickets.

Answer 1

Question is incomplete.

Assuming it means to ask, what the number of tickets they sold the previous year and the next year, the answer is:

Tickets sold last year:

x * (1 - 10%) = 18,000

x * 90% = 18,000

x = 18,000 / 90%

= 20,000 tickets last year

Next year:

= 18,000 * ( 1 - 10%)

= 18,000 * 90%

= 16,200 tickets next year.