Question

If the proper dosage of a drug is 2 mg/kg of body weight, how many milligrams would a 110-lb individual need?

Answer 1

SInce your drug's dose is expressed in mg per kg, you'll need to convert it to mg per pound first, and then determine how much a 110-lbs patient would need.

2mgkg⋅1 kg2.20462 lbs=0.9072 mg/lbs

then

110 lbs⋅0.9072mglbs=99.8 mg

Rounded to one sig fig, the number of sig figs in 2 mg, the answer will be

m drug=100 mg

You can do this in one longer step as well

2mgkg⋅1 kg2.20462 lbs⋅110 lbs=100 mg