Measurment and Dimensional

Question

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 20 pounds?

1kg ≈≈ 2.2 pounds

Answer 1

First we must note that the child is in the correct age bracket. Since 18 months is between 6 months and 2 years, this medicine can be given.

Next we must calculate the child's weight in kilograms.

1 kilogram is 2.2 pounds. So this ratio can be used to calculate the Childs weight.

20 pounds X 1 kilogram = 20 X 1kilogram =. 9.09 kilograms.

1 2.2 pounds 1 X 2.2

(The pounds label on the top and bottom of the fractions cancel each other leaving only the kilogram label.)

Now the dosage can be found by converting the Childs weight in kilograms to the appropriate milligrams of medicine.

9.09 kilogram X. 5 milligrams = 45.45 milligrams

1 1 kilogram

Again, the kilogram label on the top and bottom of the fractions cancel each other leaving only the milligram label.

Answer 2

20 pounds = (20 pounds)(1 kg / 2.2 pounds) = 9.09 kg

Dosage = (9.09 kg)(5 mg / 1 kg) = 45.45 mg