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Suppose a lab needs to make 450 liters of a 37% acid solution, but the only solutions available to the lab are 20% acid and 65% acid. What system of equations can be used to find the number of liters of each solution that should be mixed to make the 37% solution? Let c represent the number of liters of 20% acid solution and let d represent the number of liters of 65% acid solution.
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