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Mathematics 7 Online
OpenStudy (anonymous):

Every Evening Jenna Empties Her Pockets And Puts Her Change In A Jar. At The End Of The Week She Counts Her Money. One Week She Had 40 Coins, All Of Them Dimes And Quarters. When She Added Them Up, She Had A Total Of $7.75. Let D=Number Of Dimes Let Q=Number Of Quarters. How Many Quarters Did She Have ?

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