A bag has 6 yellow marbles and 6 brown marbles. Half of the brown marbles are made of glass. A marble is selected at random from the bag. What is the probability that it is a brown, glass marble?
total = 12 marbles 6 brown marbles but half of the brown marbles are made of glass so brown and made of glass = 3 probability that it is a brown, glass marble = 3/12 = 1/4
