The correct answer is: 800
Explanation:
If the threatre holds 1200 people, it means that there are total 1200 seats in the theatre.
2/3 of the total seats are sold; mathematically we can write it as:
(Total-number-of-seats) (Fraction-of-seats-sold)
1200 2/3 = 800
Hence there are 800 tickets are sold.
