Question 904553: Jo has 37 coins (all nickels, dimes, and quarters) worth $5.50. She has 4 more quarters than nickels. How many dimes does Jo have? Answer by richwmiller(17219) (Show Source):
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http://www.algebra.com/algebra/homework/word/coins/Word_Problems_With_Coins.faq.question.904491.html
and
http://www.algebra.com/algebra/homework/Expressions-with-variables/Expressions-with-variables.faq.question.104577.html
there are many more solutions