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Carla purchase 4 books for $10. Amy purchased 9 books. How much did Amy spend if her book cost the same as Carla's?
 Mar 17, 2014

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 #1
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: lol :
 Mar 17, 2014
 #2
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Carla's books cost (Total price/# of books) Therefore each book costs 10/4 = 2.5$ or 2 dollars 50 cents if Amy's books cost the same and she bought nine. Just multiple the cost per book of 2.5 times the number of books 9. The total is $22.50
 Mar 17, 2014

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