Question

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 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. Find x.​

Answer 1

Answer:

the probality will be x/12

now the total no. is 18

no of black balls = x+6

p(drawing a black ball) = x+6/18

therefore,

x+6/18= x/6

x+6=3x

2x=6

x=3

hope it will help you...

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Answer 2

Step-by-step explanation:

p(e)=x/12 eq. 1

p(e)=x+6/18. eq.2

acc. to the ques.

x/12*2=x+6/18

x/6=x+16/18

after solving the equation

x=3