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Mathematics 13 Online
OpenStudy (anonymous):

Eric has been donating books he no longer needs to his local library. After 3 months of donating, he had 157 books left in his room. After 8 months of donating, he had 102 books left in his room. How many books per month did Eric donate on average between months 3 and 8?

OpenStudy (anonymous):

-31 books per month -18 books per month -11 books per month -7 books per month

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