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A bag contains 15 white balls …

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A bag contains 15 white balls and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball find the number of black balls in the bag

Posted by Yogesh Parihar 6 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Lavina Rajput ??? 6 years, 11 months ago

No. of white balls=15 let the no. of black balls = x probability of drawing a white ball = 15/(15+x) probability of drawing a black ball = x/(15+x) According to given condition- x/(15+x)=3*15/(15+x) x=3*15 =45 therefore the no. of black balls = 45

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