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 put into the bag, the probability of drawing a red ball will be 4 5 times the probability of drawing a red ball in the first case. Find the value of x.
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hey mate
your answer
probability(not red)=20-×
20
total red balls=×+4
45(p(red balls))=p(red balls previous)
45(x+4)=×_
24 20
solve above eqn to find x
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hey the answer is below attached file :)
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