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Question:

A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. Find the number of blue balls in the jar.

Solution:

Total number of marbles=24
Let there be x green marbles and (24-x) blue marbles.
P(green) = x/24 = 2/3
Solving, we get x as 16.
So, the number of green marbles = 16 and blue marbles = 24 - 16 = 8 marbles.