urosemide is packaged as 10 mg/mL. A pharmacy technician must make a preparation totaling 25 mL of 2 mg/mL concentration. How much drug and how much diluent are used? (Textbook says use %w/v to calculate and the answer key says 5 mL concentrate; 20 mL diluent. I'm looking for how to set up and solve this problem.)

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