SOLUTION: How much vinegar must be added to a 20 liters solution which 50% pure to make a strength of 85%?

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Question 905382: How much vinegar must be added to a 20 liters solution which 50% pure to make a strength of 85%?
Answer by harpazo(655) About Me  (Show Source):
You can put this solution on YOUR website!
Here is your equation.
x + 20(0.50) = 0.85(x + 20)

Solve for x to find your answer.