Question

A certain medicine is given in an amount proportional to a patient's body weight. Suppose a patient weighing 159 pounds requirrs 212 milligrams of medicine. What is the amount of medicine required by a patient weighing 129 pounds?

Answer 1

$\bf \begin{array}{ccllll} lbs&mg\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 159&212\\ 129&x \end{array}\implies \cfrac{159}{129}=\cfrac{212}{x}$

solve for "x".