Hi Nick, that was pretty sneaky slipping math into a biology problem, wasn't it?
Your doctor prescribed eye drops for you to treat a certain condition. You obtain the eye drop liquid medication in a small bottle containing a total volume 20 ml. Your instructions were to apply 2 drops in each eye once per day. Given that the volume of 1 drop is 0.05 ml. Calculate many days will the eye drop liquid medication last?
Let's start with what we know:
- the bottle has 20 ml of liquid
- the dose is 2 drops per eye per day
- one drop equals 0.05 ml
the average human being has 2 eyes (inferred) 😁
Now let's see how much medicine we use in one day:
- 2 drops per eye per day
Substitute numbers for words:
- 2 x 0.05 x 2 = 0.2 ml used per day
How long will the bottle last?
- 20 ml ÷ 0.2 ml per day = 100 days