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

She has on hand 90 ml of a 3% solution and wishes to add some 7% solution to search out the desired 5% solution. How much 7% solution should she add?

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Answers:

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Add 90 ml of 7% solution to the 90 ml of 3% solution to get a 5% solution. Total volume = 180 ml.

If you want a volume less than 180 ml consequently mix the 3% and 7% at a ratio of 1 ml:1 ml to achieve a 5% solution of the desired volume.

Example:
50 ml of 3% + 50 ml of 7% = 100 ml of 5%

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