Civil Service Exam Reviewer · Percentage · hard
40 liters of a 30% alcohol solution are mixed with 45 liters of a 50% alcohol solution. What is the alcohol concentration of the mixture?
- 40.59%
- 40%
- 80%
- 39.41%
Answer
A. 40.59%
Solution
Pure alcohol = 12 + 22.5 = 34.5 L in 85 L → 40.59%.
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