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OpenStudy (anonymous):
Your piggy bank contains $19.75 in dimes and quarters. There are 100 coins in all. How many dimes are there?
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OpenStudy (anonymous):
let dimes = x, quarters =100 -x x*10 + (100-x) * 25 = 1975 => 2500 - 15x = 1975 => x = 525/ 15 = 35 so, dimes 35, quarters 65
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