A prescription is written for an eyedrop in each eye to be used once daily. If there are 15 drops per mL, how many days will 2.5 mL last?

Rationale

2.5 mL will last 12 days.

To determine how long the 2.5 mL of eyedrops will last with a prescribed usage of one drop in each eye daily, we first calculate the total number of drops available and then the daily consumption.

A (6) YOUR ANSWER

If 2.5 mL contains 37.5 drops (2.5 mL × 15 drops/mL), using one drop in each eye amounts to 2 drops per day. Dividing 37.5 drops by 2 drops/day results in 18.75 days, which rounds down to 18 days, not 6.

B (12) CORRECT

With 2.5 mL providing 37.5 drops, and using 2 drops per day, we find that 37.5 drops ÷ 2 drops/day equals 18.75 days. This rounds down to 18 days, not 12, so this choice is incorrect.

C (18) YOUR ANSWER

Calculating the number of drops available, 2.5 mL yields 37.5 drops. Since the prescription specifies 2 drops daily (one for each eye), dividing the total drops (37.5) by the daily usage (2) gives 18.75 days, which correctly rounds down to 18 days, making this option incorrect.

D (36) YOUR ANSWER

If the total number of drops is 37.5 and we use 2 drops each day, the calculation of 37.5 drops ÷ 2 drops/day equals 18.75 days, which is far less than 36 days. Thus, this option is also incorrect.

Conclusion

To summarize, with a total of 37.5 drops from 2.5 mL and a daily usage of 2 drops, the eyedrops will last for 18 days. None of the incorrect choices represent the correct calculation for the duration of the prescription. This understanding is crucial for proper medication management and ensuring patients adhere to their prescribed regimen.

A prescription is written for an eyedrop in each eye to be used once daily. If there are 15 drops per mL, how many days will 2.5 mL last?

2.5 mL will last 12 days.

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