SOLUTION: How many liters of water must be added to 26 liters of a 15% antifreeze solution to dilute it to a 12% solution?

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Question 394514: How many liters of water must be added to 26 liters of a 15% antifreeze solution to dilute it to a 12% solution?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.00x + 0.15*26 = 0.12(x + 26)
==> 3.9 = 0.12x +3.12
==> 0.78 = 0.12x
==> x = 6.5 liters of water must be added.