Question

A chemist has three solutions of acid and water. The first solution has 40 percent acid, the second has 60 percent acid, and the third has 80 percent acid. He mixes 2 liters of the first solution, 3 liters of the second solution, and 5 liters of the third solution. What is the percentage of acid in the final mixture?

A 20%
B 66%
C 69%
D 78%
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