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A bag contain 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is...........

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A bag contain 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is four time that of a red ball, then find the number of blue balls in the bag.

posted May 3, 2016 by Pankaj Deshmukh

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2 Answers

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let number of blue ball = x
Given
Probability(Blue ball)= 2*Probability(Red ball)
(x/(5+x))=2(5/(x+5))
solve x=10

answer May 18, 2016 by Hasan Raza
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let number of blue balls be x;
(5/(5+x))+4*(5/(5+x))=1
x=20 is you answer

answer Jun 15, 2016 by Shahsikant Dwivedi



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