Salt Solution

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A tank contains 1,000 gallons of a solution that is 6 percent salt by volume. If 200 gallons of water evaporate from the tank, the remaining solution will be approximately what percent salt?

Review: Salt Solution


Explanation

This question involves a ratio that changes. The ratio is in units of volume, volume of salt and volume of solution. Initially, we have





So the initial volume of salt is 60. The final ratio will be the same volume of salt, with units of solution:



The aim of this manipulation is to get the final ratio such that the denomination is 100, so we can pick off the numerator as the percent.



The correct answer is (D).


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