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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?

User Liangzan
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2 Answers

1 vote
11 books is the answer 
User HansTheFranz
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6 votes
11 books;

157 books - 102 books = 55 books (donated)
55 books divided by those 5 months in between is 11 books
User CREcker
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