A pharmacist wishes to mix a solution to be precise 5% Minoxidil.?

She has on hand 90 ml of a 3% solution and wishes to add some 7% solution to attain the desired 5% solution. How much 7% solution should she add?
Answers:
Use alligation method.

It would require 90 ml of 7% solution to convert the entire 90 ml of 3% solution to 5% solution.

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