Question

A bag contains 12 balls out of which x are black balls.
a). If a ball drawn at random, what is the probability that it will be a black ball ?
b). If 6 more black balls are added in the bag,the probability of drawing a black ball will be double than that of the probability obtained in part (a), find the value of x.

please answer fast, it is urgent.​

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

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