Question

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A bag contains 4 white balls and some blue balls. If the probability of drawing a blue ball from
the bag is thrice that a white ball. Find the number of blue balls in the bag.
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Answer 1

Answer:

number of white balls=4

let the number of blue balls=x

total number of balls=4+x

p(white balls) = 4 upon 4+x

p(blue ball) = x upon 4+x

according to the question, x upon 4+x = 2×4upon 4+x

> X=8

therefore, X=8

Answer 2

hope it will help u .

And the total number of balls=12