Engineering Board Exam Reviewer · Mixture Problems · easy
How many liters of pure water must be added to 20 L of a 30% alcohol solution to make a 20% solution?
- 5 L
- 10 L
- 6 L
- 20 L
Answer
B. 10 L
Solution
Alcohol stays the same: 0.30(20)=0.20(20+x) 6=4+0.2x x=10 L.
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