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OpenStudy (anonymous):

A bag of marbles has twice as many blue marbles as green marbles, and the bag has at least 21 marbles in it. At least how many green marbles does it have?

OpenStudy (anonymous):

if there is twice as much of one color than another then one color has 2/3 and the other color has 1/3.

OpenStudy (anonymous):

in this case the green is 1/3, so 1/3 of 21

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