Question

A certain medicine is given in an amount proportional to a patient's body weight. Suppose a patient weighing 159 pounds requires 212

milligrams of medicine. What is the amount of medicine required by a patient weighing
129 pounds?

Answer 1

159/ 212 = 129 / x
cross multipy
(159)(x) = (212)(129)
159x = 27348
x = 27348/159
x = 172 mg <==

Answer 2

1.333 grams per person so if you times 129 pounds by 1.33 you get  171.57 grams of medicine