Lisa and judy are wrapping gifts for their children. lisa is making the bows. she has 37 and 1/3 yards of ribbon. if each bow uses 4 and 2/3 yards of ribbon, how many bows can lisa make?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?