a bag contains 5 red balls and some Blue Balls if the probability of drawing a blue ball is double that of red ball determine the number of blue balls and bag
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6
Red ball 5
Blue ball is double of red. Ball the 5×2=10
Total balls in bag 10+5=15
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Probability = favourable outcomes/no. of outcomes
Let the no. of out comes be x
Therefore,
Number of blue balls = x - red balls
= x - 5
Probability of drawing a blue ball is double of red ball.
Probability of drawing a red ball = 5/x
Therefore, probability of finding a blue ball =
10/x
10/x = (x - 5)/x. (Blue balls = x - 5)
Therefore,
10 = x - 5
No. of blue balls = 10
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