Final answer:
To determine how many days the prescription will last, calculate the total amount of medication in milligrams. Each dose is 250mg and there are three doses per day, which means Barbara is taking 750mg of amoxicillin per day.
Step-by-step explanation:
To determine how many days the prescription will last, we need to calculate the total amount of medication in milligrams. The prescription is for amoxicillin 250mg tid (three times a day) and the medication strength is amoxicillin 125mg/5ml. So, each dose is 250mg and there are three doses per day, which means Barbara is taking 750mg of amoxicillin per day.
Next, we need to calculate how many milliliters of medication Barbara will need to take per day. Since the concentration of the medication is 125mg/5ml, we can divide 750mg by 125mg and multiply the result by 5ml. This gives us 30ml of medication per day.
Finally, we can divide the total amount of medication in the bottle (#300ml) by the amount of medication Barbara needs to take per day (30ml). This will give us the number of days the prescription will last: 300ml / 30ml = 10 days.