A doctor prescribes her patient a 20-mg dose of medicine, and the medicine has a concentration of 80 mg/ml. How much medication will the patient receive?

Use volume = dose ÷ concentration. The patient needs 20 mg, and each milliliter contains 80 mg, so 20 ÷ 80 = 0.25 ml. The patient will receive 0.25 ml of medication.

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