Question

A bag contains 6 red balls and some blue balls. If the probability of drawing a blue ball from the bag is twice that of a red ball, find the number of blue balls in the bag.

Answer 1

Given Red balls = 6

Let Blue balls = B

Total balls = B + 6

P(E)of blue balls is double than red balls

then

P(E) blue = 2 x P(E) red

= 2 x

B = 12

Therefore there are a total of 12 blue balls.