A box contains 12 balls out of which x are black. if one ball is drawn at random from the box what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find x.
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Answer:
therefore, 3 black balls...
Step-by-step explanation:
Total total number of balls =12
Total number of black balls = x
p (getting 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 balls)=x+6/18
ATQ
2(x/12)=(x+6/18)
3x=x+6
2x=6x=3
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