Question

A bag contains 10 balls out of which x are black.

(i) If one ball is drawn at random, what is the probability that it will be a black ball ?

(ii) If 5 more black balls are put in the bag, the probability of drawing a black ball will be

four times than that in (i). Find x

please answer​

Answer 1

Explanation:

• The probability of guessing the correct answer to a certain question = x/2. 1−x/2= 2/3.