## Thinking Mathematically (6th Edition)

$1~lb \approx 0.45~kg$ We can convert 120 pounds to units of kilograms. $120~lb = \frac{120~lb}{1}\times \frac{0.45~kg}{1~lb} = 54~kg$ We can find the total number of milligrams of the drug which should be administered daily. $15~mg/kg\times 54~kg = 810~mg$ We can find the number of tablets which should be given to the patient each day. $\frac{810~mg}{200~mg/tablet} = 4.05~tablets$ The patient should be given 4 tablets each day.