A stadium has 20,000 seats, divided into box seats, lower-deck seats, and upper-deck seats. Box seats sell for $10, lower-deck seats sell for $8, and upper-deck seats sell for $5. When all the seats for a game are sold, the total revenue is $140,000. The stadium has four times as many upper-deck seats as box seats. Find the number of lower-deck seats, upper-deck and box seats in the stadium.