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MEASURING LENGTH: THE METRIC SYSTEM

For each kilogram of a person's weight, 2.5 milligrams of a drug is to be given. What dosage should be given to a child who weighs 71 pounds? Use the fact that 1 lb= 0.45 kg.  (Round to the nearest whole number as needed.)
 
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1 Answer

I suggest first converting pounds to kg, and then working a proportion in kg.
 
71 pounds = (0.45 kg/lb)(71 lbs) = 31.95 kg
 
Now set up and solve a proportion.
 
x = dosage required
 
(2.5 mg) / (1 kg) = x / (31.95 kg)
 
x = (31.95)(2.5) mg = 79.875 mg

Comments

By the way, that is not a geometry problem.