Task: Question Answering
Input (English): Problem: a tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. if 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride ?
Options: a. 1.25 %, b. 3.75 %, c. 6.25 %, d. 6.67 %, e. 11.7 %
Output (English): d