A bag has 10 red marbles and 10 yellow marbles. Half of they yellow marbles are made of plastic. A marble is selected at random. What's the probability that it's a yellow plastic marble
5:20 because there are 10 red marbles and 10 yellow marbles which equals 20 marbles all together and half of the 10 yellow marbles are plastic so 10 divided by 2 = 5 (1:4 if you need it simplified)
