SOLUTION: How many liters of pure water must be added to 2 liters of a 30% antiseptic solution to obtain a 20% antiseptic solution

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Question 866617: How many liters of pure water must be added to 2 liters of a 30% antiseptic solution to obtain a 20% antiseptic solution

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
--- percent ---------------- Amount
Solution 30 ---------------- 2 liters
water 0 ---------------- x liters
Mixture 20 ---------------- 2 + x liters

30 * 2 + 0 x = 20 ( 2 + x
60 + 0 x = 40 + 20 x
0 x -20 x = -60 + 40
-20 x = -20
/ -20
x = 1 liter water

m.ananth@hotmail.ca