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When Ibuprofen is given for fever to children 6 months of age up to 2 years,
the usual dose is 5 milligrams (mg) per kilogram (kg) of body weight when the fever
is under 102.5 degrees Fahrenheit. How much medicine would be usual dose
for a 18 month old weighing 28 pounds?
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1 pound = 0.453592 kilograms.
28 pounds = 28*0.453592 kilograms = 12.701 kilograms. // forgive me physicists for using
// the kilogram as a measure of weight
To determine the dosage, multiply 5 mg per kilogram by 12.7 kilograms.
The answer is 63.5 mg.
To be sure, check that all other parameters are in the appropriate range
(the age, the temperature etc.), so you are in position to apply the formula.
Solved.
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Please keep in mind that I am only a tutor, helping you to solve a problem,
but not a doctor.
If you really are going to give the medicine to a child, ask the doctor.