Cooper and his brother collect baseball cards. cooper has 27 baseball cards in his collection and gets 11 every month. bradley has 42 baseball cards and gets 6 every month. when will cooper and bradley have the same number of cards? write an equation.

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?