You’re classroom received 150 books. you are placing them in bins. each bin holds 20 books. how many bins do you need

quotient: :
i need bins

Can someone pls ! pls answer all. no explanation needed..

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?

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.