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

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