Question

one ball is selected at random from a bag containing 12 balls of which x are white

Answer 1

Answer:

Number of balls in the bag= 12

Let the number of balls be white =x

Probability of getting a white ball =x12

If 6 more white balls are added ,

then , total number of balls =18

Now the probability of getting a white ball is

=x+618

It is given ,

x+618=2.x12

12x+72=36x

24x=72

x=3. !!!!!!Example!!!!!!?