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easy · GMAT Quantitative Reasoning

Reagent P is 10% acid and reagent Q is 50% acid. They are mixed to form 40 gallons of a 30% acid solution. Pure water is then added until the mixture is 15% acid.

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

  1. 0
  2. 20
  3. 40
  4. 2
  5. 60

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