A Broadway theater has 510 ​seats, divided into​ orchestra, main, and balcony seating. Orchestra seats sell for ​$140​, main seats for ​$135​, and balcony seats for ​$100. If all the seats are​ sold, the gross revenue to the theater is ​$62,700. If all the main and balcony seats are​ sold, but only half the orchestra seats are​ sold, the gross revenue is ​$55,700. How many of each kind of seat are​ there?