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