Question

a patient order is 60 milligrams of a drug available in stock is 90 milligrams in 1 milliliter of liquid how many milliliters should be administered

Answer 1

$\begin{gathered} \text{one has that} \\ 90\text{miligrams ----1milimeter} \\ 60\text{miligrams -----x} \\ by\text{ applying the rule of 3, one has} \\ x=\frac{(60)(1)}{90} \\ x=\frac{60}{90} \\ x=\frac{6}{9} \\ x=\frac{2}{3} \end{gathered}$