To find out how many tickets the theatre sells, we need to calculate two-thirds of the total number of seats available.
The total number of seats in the theatre is 1200. To calculate two-thirds of this amount, you can multiply 1200 by 2/3:
1200 * (2/3) = 800
This means the theatre sells 800 tickets.
In conclusion, when the theatre sells two-thirds of its 1200 available seats, it effectively sells 800 tickets.