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 a black ball ? If 6 more black balls are put in
the box, the probability of drawing a black ball now is double of what it was before. Find x.

Answer 1

Total number of balls = 12

Total number of black balls = x

P (getting a black ball) = x/12

If 6 more black balls are put in the box, then

Total number of balls = 12 + 6 = 18

Total number of black balls = x + 6

P (getting a black ball now) = x + 6 /18

Atq,

2(x/12) = ( x+. 6 /18)
3x = x+6
2x=6
x = 3

plzz mark as brainliest answer !!!

Answer 2

Answer:

Total number of balls = 12

Total number of black balls = x

P (getting a black ball) = x/12

If 6 more black balls are put in the box, then

Total number of balls = 12 + 6 = 18

Total number of black balls = x + 6

P (getting a black ball now) = x + 6 /18

Atq,