SOLUTION: a pharmacist wishes to mix a solution that is 4% of minoxidil. She has on hand 90 ml of 2% solution and she wishes to add some 6% solution to obtain the desired 4% solution. How mu

Question 651736: a pharmacist wishes to mix a solution that is 4% of minoxidil. She has on hand 90 ml of 2% solution and she wishes to add some 6% solution to obtain the desired 4% solution. How much 6% should she add?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a pharmacist wishes to mix a solution that is 4% of minoxidil. She has on hand 90 ml of 2% solution and she wishes to add some 6% solution to obtain the desired 4% solution. How much 6% should she add?
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Equation:
mino + mino = mino
0.02*90 + 0.06x = 0.04(90+x)
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Multiply thru by 100 to get:
2*90 + 6x = 4*90 + 4x
2x = 2*90
x = 90 ml (amt. of 6% solution to add)
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Cheers,
Stan H.
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