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5Lena, a chemical engineering student, is designing a reactor that requires mixing two solutions: Solution A contains 40% acid and Solution B contains 70% acid. She needs 60 liters of a 55% acid solution. How many liters of Solution A should she use?
Let x be the liters of Solution A. Then (60 - x) is the liters of Solution B.
The acid balance equation is: 0.4x + 0.7(60 - x) = 0.55(60)
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