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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 51 marbles in it. At least how many green marbles does it have?
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OpenStudy (anonymous):
\[x+2x \ge51\]
OpenStudy (anonymous):
Let x be the number of green marbles, thus \[x \ge17\]
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