The cost to repair linda's car is $500, including parts and labor. the cost of parts is $140. if the cost of labor is $40 per hour, how many hours of labor did the repairs take? a. 20 b. 1 c. 8 d. 9

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?