A town has a population of 14000 and grows at 5% every year. To the nearest tenth of a year, how long will it be until the population will
reach 32700?

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?