Question

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?

Answer 1

Short answer: 3.

9+4+5+6 = 24
24-6 = 18
18/3 = 6
9-6 = 3 Ans.