Grace L.

asked • 09/19/16

How many fluid ounces of a 60 percent saline solution must be mixed with a 75 percent saline solution to get 100 fluid ounces of a 72 percent solution?

There are four possible answers:
a. 15 fluid ounces.
b. 20 fluid ounces.
c. 24 fluid ounces.
d. 30 fluid ounces
Word problems like these confuse me and I just don't know where to put what. Help is appreciated!

3 Answers By Expert Tutors


Aiden A. answered • 10/07/16

New to Wyzant

Aiden A. Marietta, GA

Amy F. answered • 09/23/16

4.7 (21)

Amy for Pharmacy and GED

Amy F.

You are quite welcome. This is a common pharmacy calculation. It's the method used when we are preparing a concentration of a liquid or solid medication that is unavailable commercially.  We use concentrations that are available and mix/dilute them to the needed strength.   It's a very clever and easy way to calculate 2 unknowns. 


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