Question

insulin comes in 10 cubic centimeter (cc) vials labeled in the number of units of insulin per cubic centimeter of fluid. a vial marked u40 has 40 units of insulin per cubic centimeter of fluid. if a patient needs 15 units of insulin, how much fluid should be drawn into the syringe from the u40 vial?

the amount of fluid containing 15 units of insulin is cc.
(type an integer or a decimal.)

Explanation:

Step1: Set up proportion

Let $x$ be the volume of fluid in cc. We know that the ratio of units to volume is constant. So, $\frac{40\text{ units}}{1\text{ cc}}=\frac{15\text{ units}}{x\text{ cc}}$.

Step2: Cross - multiply

$40x = 15\times1$.

Step3: Solve for $x$

$x=\frac{15}{40}=\ 0.375$.

Answer:

$0.375$