Question

19. A bag contains 20 balls out of which x are white,
(a) If one ball is drawn at random, find the probability that is white.
(b) If 10 more white balls or
put in the bag, the probability of drawing a white ball will be double that in part (a),
finds.

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Answer 1

Answer:

Step-by-step explanation:Step-by-step explanation:

A bag contains 20 balls out of which x balls are white

Probability of White Ball  = x/20

=> y = x/20

place this ball and 10 more white balls in the bag

=> White Balls = x + 10

& Total Balls = 20 + 10 = 30

Probability of White Ball  =  (x + 10)/30

=> 2y  = (x + 10)/30

=> 2 (x/20) =  (x + 10)/30

=> 3x = x + 10

=> 2x = 10

=> x = 5