There are 12 marbles in a bag, and the marbles are either yellow or green. Two marbles will be randomly picked from the bag, without replacing the first one picked. The probability that both marbles will be yellow is 5 33 . How many GREEN marbles are in the bag?
10 because if you divide 100 ( percent ) by 5 (chance of yellow) you get 20 and 20 divided by 2 ( two colors) you get 10 :)