Problema Solution
You have been asked by the pharmacist to prepare 3 liters of a 30% strength solution. Your pharmacy stocks the active ingredient in 8 ounce bottles of 70% strength. How many bottles of the active ingredient will you need to open to complete this request?
Answer provided by our tutors
1 Liter = 33.81 ounces.
To prepare a 30% 3 litre solution we require 0.3 * 3 * 33.81 = 30.429 ounces.
But each bottle has 70% 8 ounces = 0.7 * 8 = 5.6 ounces of concentrate.
Hence We need 30.429/5.6 = 5.43375 bottles to prepare the solution.
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