An infusion set delivers 20 drops per ml. How many drops per minute are needed to give 500 ml in 120 minutes?
Answer and explanation
Correct answer: B. 83.3 drops/min
- Step 1: Drops per minute = volume x drops per ml / minutes. Step 2. 500 x 20 / 120 = 83.3. Answer: 83.3 drops/min. Why not the others: 3000 drops/min: the drop factor was used as a divisor. 4.2 drops/min: this is ml per minute, the drop factor was left out. 166.7 drops/min: the result was doubled.
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