Question

A box contains 12 balls out of which rare 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.​

Answer 1

Answer:

1/7 and the value of x is 56

Answer 2

Answer:x=3

Step-by-step explanation:

Probability of getting a black ball =x/12

6 more balls are added

Therefore total no of balls =12+6=18

Number of black balls =x+6

Probability is doubled as given in question

Therefore 2(x/12)=x+6

Solving this equation we get x=3

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