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If 6 books cost 10 dollars, how much would it cost to buy 9 books?

User KRB
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1 Answer

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If 6 books cost 10 dollars 9 books will cost 15 dollars. Divide 10 by 6 to get 1.66666667 then multiply 1.66666667 by 9 to get 15.
User Premprakash
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