Question

A jar contains 24 marbles. Some of these are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is $\frac{2}{3}$. Find the number of blue marbles in the jar.

Answer 1

Total number of marbles = 24

P(getting a green marble) = 2/3

No. of green marbles = 2/3 $\times$ 24 = 16

So, no. of blue marbles = 24 - 16 = 8