SOLUTION: How much water must be added to 20liters of a 50% antifreeze to reduce it to 40% antifreeze?

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Question 986955: How much water must be added to 20liters of a 50% antifreeze to reduce it to 40% antifreeze?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How much water must be added to 20liters of a 50% antifreeze to reduce it to 40% antifreeze?
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Add x liters of water.
20*50 + x*0 = (20 + x)*40
Solve for x