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medium · GMAT Quantitative Reasoning

Stock P is 25% acid and stock Q is 55% acid. They are mixed to form 50 gallons of a 40% acid solution. Pure water is then added until the mixture is 25% acid.

How many gallons of water are added in that final step?

  1. 55
  2. 20
  3. 0
  4. 25
  5. 30

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