A lab prepared a solution by combining some milliliters of 12% saline with some milliliters of 20% saline. What was the percent concentration of saline in the resulting mixture?
Statement 1: The volume of the 12% solution used was 30 milliliters greater than the volume of the 20% solution used.
Statement 2: The final mixture contained 150 milliliters of solution.
This v1 loop uses an imported draft-bank subset and server-side answer checks. CAT behavior and precise score prediction are intentionally not part of this MVP.