Question 2 options: all questions are about this system of equations: {5x +18y =23 x +3y = 2 when you multiply the second equation by this number, what does it become?

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?