Probability Math Please help

Which of the greatest common gcf of 32 and 48 a 16 b 96 c 8 d 32

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

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?