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GMAT - Problem Solving - Percentage

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?

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?

(A) 1.25%
(B) 3.75%
(C) 6.25%
(D) 6.67%
(E) 11.7%

Initial volume of sodium chloride = 5% of 10000 = 500

new volume of the solution after evaporation of 2500 gallons of water = 10000 - 2500 = 7500

New percentage of sodium chloride in the solution = 500/7500 * 100 = 6.67%

D is correct