Question

gmp's
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.​

Answer 1

Answer:

Total number of balls = 12

Let the number of black balls be x.

P(drawing a black ball) =

It is given that 6 more black balls are put in the box.

Now, we have:

Total number of balls = 18

Number of black balls = x + 6

P (drawing a black ball) =

Therefore, we have:

Answer 2

Explanation:

Initially, total number of balls =12

No. of black balls =x

So, P(black ball) =12x

If 6 more black balls are added, total number of balls =12+6=18

NO. of black balls =x+6

P(black ball) = 18x+6

Given the probability of drawing a black ball is now double of what it was before

So, 122x=18(x+6)

6x=18(x+6)

3x=x+62x=6x=3

So, the number of black balls present initially =3.

I hope my answer is correct and keep it up!!!

Good morning have a nice day

And make me a brainlest answer pls