Using a set that delivers 60 drops per mL, how many drops are delivered over a 120 mL infusion?

Using a set that delivers 60 drops per mL, how many drops are delivered over a 120 mL infusion?

• A. 3600 drops
• B. 10800 drops
• C. 7200 drops
• D. 14400 drops

Answer: (C)

Total drops come from multiplying how many drops occur in each milliliter by the total number of milliliters delivered. Here, 60 drops per milliliter times 120 milliliters equals 60 × 120 = 7200 drops. The units cancel appropriately, leaving drops. So over the 120 mL infusion, 7200 drops are delivered. (A quick check: using a different pairing like 60 × 60 or 120 × 120 would imply a different volume or drop factor, which isn’t the case here.)

Total drops come from multiplying how many drops occur in each milliliter by the total number of milliliters delivered. Here, 60 drops per milliliter times 120 milliliters equals 60 × 120 = 7200 drops. The units cancel appropriately, leaving drops. So over the 120 mL infusion, 7200 drops are delivered. (A quick check: using a different pairing like 60 × 60 or 120 × 120 would imply a different volume or drop factor, which isn’t the case here.)