A bag contains 3 red and some Blue Balls. If the probability of drawing a blue ball is 4 times that of drawing a red ball .Find the number of blue balls in the bag.

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Solution

Let the number of blue balls in the bag be x
So total number of balls in the bag = 3+x

P (blue ball) =4 x P(red ball)
x/(3+x)= 4. 3/(3+x)
X=12
So total number of blue balls =12

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A bag contains 3 red and some Blue Balls. If the probability of drawing a blue ball is 4 times that of drawing a red ball .Find the number of blue balls in the bag.

Let the number of blue balls in the bag be x So total number of balls in the bag = 3+x P (blue ball) =4 x P(red ball) x/(3+x)= 4. 3/(3+x) X=12 So total number of blue balls =12

Let the number of blue balls in the bag be x
So total number of balls in the bag = 3+x

P (blue ball) =4 x P(red ball)
x/(3+x)= 4. 3/(3+x)
X=12
So total number of blue balls =12