Abroadway theater has 700700 seats, divided into orchestra, main, and balcony seating. orchestra seats sell for $ 40 comma$40, main seats for $ 30 comma$30, and balcony seats for $ 20.$20.  if all the seats are sold, the gross revenue to the theater is $ 20 comma 100.$20,100.  if all the main and balcony seats are sold, but only half the orchestra seats are sold, the gross revenue is $ 17 comma 300.$17,300. how many are there of each kind of seat?