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A bag contains 6 blue , 2 red , and 2 yellow . The probability of drawing a blue marble out of the bag is

A bag contains 6 blue , 2 red , and 2 yellow . The probability of drawing a blue marble out of the bag is 6/10 or 60%. How many of what color of marbles must be added to the bag so that the probability of a blue marble being drawn at random from the bag is 90%?

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