Question

A bag contains 12 balls out of which x are black balls. Find the
probability of getting a black ball if one ball is drawn. If 6 more
blacks balls are added in the bag, the probability of getting a
black ball will be double. Find x.​

Answer 1

x/12 is the probability of getting a black ball if one ball is drawn.
If 6 more balls are added then the probability would be (x+6)/18.

Answer 2

Answer:

Step-by-step explanation:

Total number of balls = 12

Total number of black balls = x

P (getting a black ball) = x/12

If 6 more black balls are put in the box, then

Total number of balls = 12 + 6 = 18

Total number of black balls = x + 6

P (getting a black ball now) = x + 6 /18

Atq,

2(x/12) = ( x+. 6 /18)

3x = x+6

2x=6

x = 3