A bag contains 15 balls out of which x are white and rest are red. If the probability of drawing a white ball is 4 times the probability of drawing a red ball find x.
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Answer:
x = 8
Step-by-step explanation:
Total No . of Obs = 18
No . of Red Balls = x
Probability of Red Ball = Favourable Obs / Total No. of Obs
P(of Red Ball) = x/18
Two Red Balls Are Added
So,
No . of Red Balls = x + 2
Total no .of Balls = 18 + 2 = 20
P(of red Ball) = x + 2 / 20
P given 9 times of P obtained in A
9/8 * x/18 = (x + 2)/20
x / 16 = (x + 2)/20
(x / 16) * 20 = x + 2
5x / 4 = x + 2
5x = 4x + 8
5x - 4x = 8
x = 8
Therefore,
Initial No.Of Red Balls = 8
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