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A bag contains 15 white 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. Mathematics CBSE class 10 2017

A bag contains 15 white 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.


Asked On2017-07-12 16:02:20 by:tarun101

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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

Answerd on:2017-07-27 Answerd By:akialwayz

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