A bag contains 15 white and some black balls. If the probability of drawing a black ball from the

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#Abagcontains15whiteandsomeblackballsIftheprobabilityofdrawingablackballfromthe


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