Monica and her puppy are both dressing up as superheroes for Halloween this year. Monica needs 1 yard of cloth for her cape. She also needs 1 foot of cloth for her puppy's cape. How many feet of cloth should she buy for their capes?

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?