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.
Answers
Answered by
3
no of black balls are x
total balls are 12 so
probability of black ball drown is x/12
now total black balls are x+6
now probability of black ball is x+6/12
according to question
x+6/12=2*x/12
x+6=2x
x=6
total balls are 12 so
probability of black ball drown is x/12
now total black balls are x+6
now probability of black ball is x+6/12
according to question
x+6/12=2*x/12
x+6=2x
x=6
Similar questions