A nurse is preparing to administer quinapril 20 mg PO. Available is quinapril 40 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Identify the given information: Dose of quinapril: 20 mg Concentration of quinapril tablets: 40 mg/tablet Calculate the number of tablets to be administered: Number of tablets = Dose (mg) / Concentration (mg/tablet) Substitute the values: Number of tablets = 20 mg / 40 mg/tablet Number of tablets = 0.5 tablets