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.
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sawakkincsem:
The answer is 45 and this answer is correct. Thank you!
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Answer:
Step-by-step explanation:
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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