Ryan had some candy to give to his five children. He first took eight pieces for himself and then evenly divided the rest among his children. Each child received four pieces. With how many pieces did he
start?

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?