The physician prescribed 20 mg of a medication that is available 10 mg per 15 milliliters. How many milliliters would the nurse administer?
A) 10
B) 15
C) 20
D) 30

Question

Quizplus · Accepted Answer

When the amount of drug prescribed is different from the supply, you can solve the dosage problem with proportion, either using ratios or fractions. When one of the numbers is unknown, the letter x substitutes for the missing number. Proportion (Ratios): 15 mL : 10 mg :: x mL : 20 mg; 10x = 300/10 = 30 mL. Proportion (Fractions): 15 mL/10 mg = x mL/20 mg; 10x = 300/10 = 30 mL.

The Physician Prescribed 20 Mg of a Medication That Is