Question

A bag contain 12 balls Out of which x are Black. If the 6 more black balls are put In the box find the probability of drawing a black ball is now double of what it was Before. Find x?
A.3
B. 2
C. 1
D. 4

Answer 1

Answer:

Option A. 3 is the correct answer.

Hope it helped you...

Answer 2

Answer:

Hey! beautiful here is your answer babe.

I think u missed to write something in this ques

ques. a box is contains 12 balls out of which x are black. if one ball is drawn random from the box, what is the probability that 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.

Total no. of balls in box= 12

no. of black balls=x

no. of fav outcomes = x

=no. of fav outcomes / total no. of possible outcomes= x/12

if 6 more black balls are put in the box

then, total no. of balls in the box =12+6=18 and no. of black balls in the box=6+x

total no. of possible outcomes = 18

no. of fav outcomes = 6+x

now, p(drawing a black balls) =6+x/18

acc. to ques,

6+x/18=2*x/12

6+x/18 = x/6

6(6+x)=18x

36 + 6x = 18x

18x-6x=36

12x=36

x=36/12=3

hence, total black balls = 3 ans.

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