A pharmacist wants to mix a solution that is 4% Minoxidil.?

A pharmacist wishes to mix a solution that is 4% Minoxidil. She has on hand 40 ml of a 3% solution and she wishes to add some 6% solution to obtain the desired 4% solution. How much of the 6% solution should she add?

Answer:
We'll assume it's weight %, and that you are starting with all of the 40 ml of the 3% solution

so your problem then is this

(40ml * (3g/100ml) + xml * (6g/100ml) )/ (40 + x ml) * 100 = 4 %

(1.2 g + 0.06 x)* 100 / (40 + x) = 4

120 + 6 x = 160 + 4x

2x = 40

x = 20 ml

which works

40 ml of 3% + 20 ml of 6% will give 60 ml of a 4% solution

40ml ( 3g/100ml) = 12 g

20ml ( 6g/100ml) = 12g

24g / 60 ml * 100 = 4%
3%
the answer depends on whether you want 6% by weight or by volume, and also, if the 3 and 6% solutions are given by wait or by volume

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