SOLUTION: How much water should be added to 85ml of 40% acid solution to dilute it to a 20% acid solution?

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Question 854436: How much water should be added to 85ml of 40% acid solution to dilute it to a 20% acid solution?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent the amount of water added

    WATER      = WATER

 .60(85ml) + x = .80(85ml + x)

             x = .20(85ml)/.20   = 85ml of water needs to be added