Question

You work in a pharmacy that mixes different concentrations of saline solutions for its customers. The pharmacy has a supply of two concentrations, 0.50% and 2%. The function y = 100(0.02) + x(0.005) / 100+x gives the amount x in milliliters of the 0.5% solution you must add to 100 milliliters of the 2% solution to form a new concentration y of saline solution. How many milliliters of the 0.5% solution must you add for the combined solution to have a concentration of 0.78%
You must add approximately (answer) mL.
(round to one decimal as needed).

Answer 1

The answer is 435.7 mL. See below for a worked solution.

**Just for future reference, please type your equation more clearly. I thought you meant y = 100(0.02) + [x(0.005)/(100+x)], and not y = [100(0.02) + x(.005)]/(100+x).