Q. 3 4.5( 57 Votes )

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag

Answer :

Let the number of blue balls be x.

Number of red balls = 5

Total number of balls = x + 5

P (getting a red ball) =

P (getting a blue ball) =

It is given that,

Probability of getting a blue ball is two times the probability of getting a red ball. Therefore,

Hence, number of blue balls = 10

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