Answer:
Step-by-step explanation:
1 dose = 2 drops * 180 / 10 = 36 drops /dose
4 doses = 4 * 36 = 144 drops / day.
144 drops * 365 = 52560 drops / year
52560 * 5 = 262800 drops / 5 years.
262800 / 20 = 13140 mL
13140 ml / 1000 = 13.140 L for a 5 year supply.
We are still not quite finished. There must be at least 1 leap year and maybe 2.
1 leap year would add 0.144 Liters
2 leap years would add 0.288 liters
I'm not sure how to finish the problem. I am going to say that we should ignore the leap years and stick with the answer. 13.140 L for 5 years.
Interesting question.