SOLUTION: A box contains 6 white balls, 7 black balls, and 5 red balls. How many red balls must be added to the box so that probability of drawing a red ball is 6/7?
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Question 1016501: A box contains 6 white balls, 7 black balls, and 5 red balls. How many red balls must be added to the box so that probability of drawing a red ball is 6/7?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
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x=red balls to add
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Cross multiply.
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ANSWER: Add 108 red balls.
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