An infusion set delivers 20 drops per ml. How many drops per minute are needed to give 200 ml in 40 minutes?
Answer and explanation
Correct answer: A. 100 drops/min
- Step 1: Drops per minute = volume x drops per ml / minutes. Step 2. 200 x 20 / 40 = 100. Answer: 100 drops/min. Why not the others: 400 drops/min: the drop factor was used as a divisor. 5 drops/min: this is ml per minute, the drop factor was left out. 200 drops/min: the result was doubled.
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