A bag contains 5 red marbles, 8 blue marbles, and 3 green marbles. If a green marble is drawn you win $5, and if a red marble is drawn you win $1. Drawing a blue marble causes you to lose $1. Suppose you make 81 draws out of the bag Your chances remain the same, the number of red, blue and green marbles doesn't change from draw to draw. This corresponds to drawing how many tickets at random?