Question

A bag contains 12 balls out of which x are black.

[ 1 ]If a ball drawn at random, what is the probability that it will be a black ball?
[ 2 ] If 6 more black balls are put in the bag, the probability of drawing a black ball will be double than that of [ 1 ]. Find the value of x. ​

Answer 1

Answer:

1.x/12

2.x+6/18=2x/12

x+6=3x

2x=6

x=3.