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d = q + 3; 10d + 25q = 345. 10(q + 3) + 25q = 345 ie 35q = 315 so q = 9 and d = 12. Check: 9 quarters = $2.25, 12 dimes = $1.20, total $3.45.QED

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Q: In a collection of dimes and quarters there are 3 more dimes than quarters If the collection is worth 3.45 how many dimes and quarters are there?
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