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Mathematics 12 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?

JoelTheBoss (joel_the_boss):

-11 per month

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