Question 373377: if there are 18 quarts thats 65% water how many more quarts do you need to be 80% water
Answer by robertb(5830)   (Show Source):
You can put this solution on YOUR website! If you are ADDING WATER to dilute the mixture, then
letting x = # of quarts water that had to be added, we get
0.65*18 + x = 0.80(x+18),
11.7 + x = 0.80x + 14.4,
0.20x = 2.7,
x = 13.5, # of quarts water that had to be added.
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