a bag contains 4 white balls and some blue balls . if the probability of drawing a blue ball is trice that a white ball . find the no. of blue balls in the bag

Question

a bag contains 4 white balls and some blue balls if the
probability of drawing a blue ball is trice that a white ball find
the no of blue balls in the bag

Manbar Singh · Accepted Answer

Let the number of blue balls in the bag = xnumber of white balls = 4Total number of balls = x + 4Pdrawing a white ball = number of white ballstotal balls = 4x+4Pdrawing a blue ball = number of blue ballstotal balls = xx+4Now, Pdrawing a blue ball =3× Pdrawing a white ball⇒xx+4 = 3×4x+4⇒xx+4 = 12x+4⇒x = 12Hence, the number of blue balls = 12