A box 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 \(\frac{2}{3}\). The number of blue balls in the jar is:

Explanation: Total number of marbles = 24. Let \(N_G\) be the number of green marbles. Probability of drawing a green marble, \(P(\text{Green}) = \frac{\text{Number of Green Marbles}}{\text{Total Marbles}}\). \(\frac{2}{3} = \frac{N_G}{24}\). \(N_G = \frac{2}{3} \times 24 = 2 \times 8 = 16\). Number of blue marbles (\(N_B\)) = Total marbles - Number of green marbles. \(N_B = 24 - 16 = 8\).