The total  number of seats in the theater is 600 seats, if the students filled up 570 seats, which was 95% of the total number of seats in the theater.
Step-by-step explanation:
The given is,
                  Seats filled by students are 570 seats
                  Which is 95% of the total number of seats in the theater
Step: 1
                 Let, x - Total number of seats available in theater
                 Percentage of seats filled, y= 95%
                 Seats filled by students = 570
                 Formula to calculate total number of seats in theater,
                            95% of seats   
     
                                          570 = 
                                               x = 
                                                  = 600
                                               x = 600 seats
Step: 2
              Check for solution,
                             5% of seats  
                                                   = (0.05 × 600)
                                                   = 30 seats
                     Total no. of seats = 5% of seats  + 95% of seats
                                                   = 30 + 570
                                           600 = 600
Result:
            The total  number of seats in the theater is 600 seats.