College

You're working in a pharmacy and are making a table to help with dosage amounts for a certain drug. The recommended dosage is 40 milligrams per 2.2 pounds of body weight, divided into three daily doses and taken every 8 hours. You want entries for children weighing 10 pounds, 15 pounds, and 30 pounds. The drug comes in a [tex]$200 \text{ mg} / 5 \text{ ml}$[/tex] formula. If 1 teaspoon is 5 ml, how many teaspoons are required for each entry? Round your answer to the nearest [tex]$\frac{1}{4}$[/tex] teaspoon.

A. [tex]1, 1 \frac{1}{2}, 2 \frac{3}{4}[/tex]

B. [tex]181, 272, 545.5[/tex]

C. [tex]10, 15, 30[/tex]

D. [tex]4.5, 7, 13[/tex]

Answer :

To determine how many teaspoons of medication are necessary for each child's weight, we can follow these steps:

1. Understand the Dosage Per Weight:
- The recommended dosage is 40 milligrams per 2.2 pounds of body weight.

2. Convert the Child's Weight to Dosage in Milligrams:
- First, find out how many sets of 2.2 pounds are in each child's weight: divide the child's weight by 2.2.
- Multiply the result by 40 milligrams to find the total dosage in milligrams.

3. Understanding the Medication Concentration:
- The medication is provided in a concentration of 200 milligrams per 5 milliliters.
- This means each milliliter contains 200/5 = 40 milligrams of the drug.

4. Convert Milligrams to Milliliters:
- Divide the milligrams by the concentration (40 mg/ml) to find how many milliliters are needed for the given dosage.

5. Convert Milliliters to Teaspoons:
- Since 1 teaspoon is 5 milliliters, divide the milliliters by 5 to convert it to teaspoons.

6. Round to the Nearest 1/4 Teaspoon:
- Round the number of teaspoons to the nearest 1/4 (0.25) teaspoon to make it easy to measure.

Here are the specific calculations for each child's weight:

- For a Child Weighing 10 Pounds:
- Calculate the dosage: (10 / 2.2) × 40 = approximately 181.82 mg.
- Convert to milliliters: 181.82 mg ÷ 40 mg/ml = approximately 4.545 ml.
- Convert to teaspoons: 4.545 ml ÷ 5 ml/teaspoon = approximately 0.909 teaspoons.
- Round to nearest 1/4 teaspoon: approximately 4.5 teaspoons.

- For a Child Weighing 15 Pounds:
- Calculate the dosage: (15 / 2.2) × 40 = approximately 272.73 mg.
- Convert to milliliters: 272.73 mg ÷ 40 mg/ml = approximately 6.818 ml.
- Convert to teaspoons: 6.818 ml ÷ 5 ml/teaspoon = approximately 1.364 teaspoons.
- Round to nearest 1/4 teaspoon: approximately 6.75 teaspoons.

- For a Child Weighing 30 Pounds:
- Calculate the dosage: (30 / 2.2) × 40 = approximately 545.45 mg.
- Convert to milliliters: 545.45 mg ÷ 40 mg/ml = approximately 13.636 ml.
- Convert to teaspoons: 13.636 ml ÷ 5 ml/teaspoon = approximately 2.727 teaspoons.
- Round to nearest 1/4 teaspoon: approximately 13.75 teaspoons.

So the number of teaspoons required is approximately:
- 4.5 teaspoons for 10 pounds,
- 6.75 teaspoons for 15 pounds,
- 13.75 teaspoons for 30 pounds.