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Mathematics 9 Online
OpenStudy (anonymous):

Samuel wants to buy at least twice as many DVDs as CDs. CDs sell for $7 each, and DVDs sell for $12 each. Samuel can spend a maximum of $50. Let c represent the number of CDs, and let d represent the number of DVDs. Which system of inequalities can be used to find the number of CDs and DVDs Samuel can buy?

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