Q. 194.4( 14 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.
To Find: The number of blue balls
Given: Number of red balls = 5
P(blue) = 2 P(Red)
Let the number of blue balls = x
Total number of balls = blue balls + red balls
Total balls = x + 5
The probability of drawing a red ball, P(Red)
The probability of drawing a blue ball, P(blue)
x = 10
Therefore, x = 1, as it cannot be negative.
Hence, the number of blue balls is 10.
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