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 is now
double of what it was before. Find x.​

Answer 1

Answer:

P(BLACK)=x/20

P(b)=x+6/26

now ATQ

2(x/20)=(x+6/26)

x/10=x+6/26

by cross multiply..

26x=10x+60

16x=60

x=60/16=30/8=15/4

Answer 2

x=3

Mark brainliest please