Question

3. 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.
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Answer 1

Answer:

I think it is 10 but I am not sure

Step-by-step explanation:

I hope it is helpful and when it is

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Answer 2

Let number of blue balls be x.

Total number of balls in bag = 5+x

2(Probability of red ball) = probability of blue ball

2( 5/5+x) = x/5+x

10/5+x = x/5+x

10(5+x) = 5+x(x)

50+10x = x² + 5x

x² - 5x - 50 = 0

x²-10x+5x-50 = 0 (splitting the middle term)

x(x-10) + 5(x-10) = 0

(x+5)(x-10) = 0

x = -5 or 10

x= 10 (number of balls can't be negative)

Answer: Number of blue balls: 10