Math
posted by Jason .
there are 9 blue marbles, 4 black marbles, 5 white marbles and 6 red marbles. If the probability of drawing a blue marble is now 1/3, how many of the 6 marbles removed were blue?

Short answer: 3.
9+4+5+6 = 24
246 = 18
18/3 = 6
96 = 3 Ans.