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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 monhs 3 and 8?

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 class=
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 class=

Sagot :

he donated 18 books per month. you first finds the difference of the books then do use the number of books by the number of months (in this case it was 5 months)
157 - 102 = 55
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8-3 = 5

55/5 = 11 books