So first, we figure out the maximum the patient could be taking each day: 2 tabs every 4 hours = 12 tabs per day at the most. Then we divide #40 by 12 and round down: we come up with 3 days supply. While there would still be 4 tablets remaining, the would not last the patient another day at the maximum dose, so we round down to the closest whole number.
Patient is prescribed 10g of Glucose. The glucose is presented as a 5% solution in 500ml Saline. How much of the 5% dextrose saline solution do you need