Answer: 54.43 miligrams
Explanation:
To calculate the dose of ibuprofen for an 18-month-old child weighing 24 pounds, we need to convert the weight from pounds to kilograms.
1 pound is equal to 0.453592 kilograms.
So, the weight of the child in kilograms is:
24 pounds × 0.453592 kg/pound = 10.886kg (rounded to three decimal places)
Now we can use the given dosage information to calculate the usual dose of ibuprofen for the child.
The usual dose of ibuprofen is 5 mg/kg of body weight when the fever is under 102.5 degrees Fahrenheit.
So, for the 18-month-old child weighing 10.886 kg, the usual dose of ibuprofen would be:
5 mg/kg × 10.886 kg = 54.43 mg
Therefore, the usual dose of ibuprofen for an 18-month-old child weighing 24 pounds is 54.43 mg.