Question

# A box contains 12 balls out of which x are blue. If one ball is drawn at random from the box, what is the probability that it will be a blue ball ? If 6 more blue balls are put in the box , the probability of drawing a black ball is now double of what it was before . Find x

Open in App
Solution

## Number of blue = x Total number of balls = 12 Hence P ( getting a blue ball ) = x12 (ii) Value of x 6 more balls were added . Hence P( getting blue ball ) = x+612+6 = x+618 Given the probablity of drawing blue ball is now double Hence x+618 = 2 × x12 x+618 = 2 × x6 6x + 36 = 18 x 12 x = 36 x = 3

Suggest Corrections
0
Explore more