Please Help! Needed as soon as possible! Thanks to whoever helps.

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?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid