A box contains 12 balls out of which x are black. If one ball is drawn – InterviewSolution

1.	A box contains 12 balls out of which x are black. If one ball is drawn at random from the box. What is thr probability that it will be the black ball. If 6 black balls are added in the box, then the probability of drawing a black ball is now double of what it was before. Find x.
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