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12. If Zoey has a bag of marbles containing 18 red marbles, how many blue marbles should she add to the bag so that the probability of her drawing a blue marble from the bag is \frac{1}{4} 1 4 ?
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12. If Zoey has a bag of marbles containing 18 red marbles, how many blue marbles should she add to the bag so that the probability of her drawing a blue marble from the bag is \frac{1}{4}

1
4
?

User GedankenNebel
by
7.8k points

1 Answer

4 votes
she should add six blue marbles

User Ug
by
7.8k points
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