medium · GMAT Quant

A laboratory technician has 12 liters of a liquid solution that is 20 percent acid by volume. The technician adds x liters of a second solution that is 50 percent acid by volume to create a final mixture that is 30 percent acid by volume.

What is the value of x?

  1. 6
  2. 5
  3. 10
  4. 8
  5. 4

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