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In a protein assay, the original sample was first diluted 1/5. Then 5ml of the diluted...

In a protein assay, the original sample was first diluted 1/5. Then 5ml of the diluted sample was mixed with 20ml of reactants to give 25 ml total. 5 mL were removed from the 25 mL mixture. The 5mL contained 3 mg of protein. What was the concentration of protein in the original sample?

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