1 Bob is building a scale model of his bike. He wants his model to be as long as his bike.
If Bob's bike is 45 inches long, how long will his model be?
His model will be
Jinches long.

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?