Question

The typical child dosage of amoxicillin (an antibiotic) is 25 mg/kg/day. What is the mass in kilograms of a child weighing 48 lb? (1 lb = 453.6 g)

a) 10.89 kg
b) 21.78 kg
c) 43.56 kg
d) 54.45 kg

Answer 1

To find the child's mass in kilograms, convert the weight from pounds to grams using the conversion factor, and then convert grams to kilograms. The child weighing 48 lb is approximately 21.78 kg.

Step-by-step explanation:

To convert the child's weight from pounds (lb) to kilograms (kg), we use the given conversion factor: 1 pound = 453.6 grams.

First, we convert the weight from pounds to grams:

• 48 lb × 453.6 g/lb = 21772.8 g

Next, we convert grams to kilograms by dividing by 1000 (since there are 1000 grams in a kilogram):

• 21772.8 g / 1000 = 21.7728 kg

After rounding to two decimal places, we find that the child weighs approximately 21.78 kg.

Therefore, the correct option is b) 21.78 kg.