题目:
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?
选项:
A、1.25%
B、3.75%
C、6.25%
D、6.67%
E、11.7%
答案:
D