Question

5. A bag contains 20 balls out of which x balls are red.
(i) If one ball is drawn at random from the bag, find the probability that it is not red.
(ii) If 4 more red balls are out into the bag, the probability of drawing a red ball will
be 5/4 times the probability of drawing a red ball in the first case. Find the value of x.

​

Answer 1

i guess ... may be 5 .. is it right ?