SOLUTION: A pharmicis has 200 milliliters of a solution that is 40% active ingredient. How much pure water should she add to the solution to get a solution that is 25% active ingredient?

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Question 122323: A pharmicis has 200 milliliters of a solution that is 40% active ingredient. How much pure water should she add to the solution to get a solution that is 25% active ingredient?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
80=50+.25X
.25X=80-50
.25=30
X=30/.25
X=120 AMOUNT OF PURE WATER NEEDED TO MAKE THE PROPER MIX.
.4*200=.25(200+120)
80=.25*320
80=80