SOLUTION: how many milliliters of pure water should a pharmacist add to 50 ml of a 15% minoxidil solution to make a 10% minoxidil solution?

Question 977635: how many milliliters of pure water should a pharmacist add to 50 ml of a 15% minoxidil solution to make a 10% minoxidil solution?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
how many milliliters of pure water should a pharmacist add to 50 ml of a 15% minoxidil solution to make a 10% minoxidil solution?
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Equation:
water + water = water
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0.85*50 + 1*x = 0.9*(50+x)
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85*50 + 100x = 90*50 + 90x
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10x = 5*50
x = 25 ml (amt. of water to add)
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Cheers,
Stan H.
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