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at books unlimited, 3 books cost $18. what much would 7 books cost ? how many books could be purchased with $54? show your work. pls help
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at books unlimited, 3 books cost $18. what much would 7 books cost ? how many books could be purchased with $54? show your work. pls help

User DoctorDestructo
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First you have to find the unit rate by dividing $18 by 3 books. You get $6 per book. To find the cost of 7 books multiply 7 by $6 and you get $42. To find how many books you can buy with $54 divide 54 by 6 and you get 9 books.
User Campsjos
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