In 2 months, mica spent a total of $305.43 on groceries. she spent $213.20 in the first month. how much did she spend in the second month?

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?