medium · GMAT Quantitative Reasoning
Reagent P is 5% acid and reagent Q is 35% acid. They are mixed to form 18 gallons of a 20% acid solution. Pure water is then added until the mixture is 10% acid.
How many gallons of water are added in that final step?
- 27
- 9
- 0
- 9/10
- 18
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