To find out how many tickets the theater sells, we need to calculate one-third of the total number of seats available.
The theater has a total capacity of 1800 seats.
The calculation to find one-third of the seats is:
1800 × (1/3) = 600
Thus, the theater sells a total of 600 tickets.
This means that when the theater sells one-third of its available seating, they are able to accommodate 600 people in their performances.