A solution of X pounds of water and sugar is boiled until 20% of the water content evaporates. Originally y% of sugar was present in the solution. After evaporation, what percentage of the solution is sugar?

Answer Choices

Correct answer marked below

100y/(1-y)

80y/(1-y)

75y/(1-y)

100y/(80-0.2y)

100y/(80+0.2y)

Correct

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Explanation

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Official Explanation

Official

Assume values when the options have a variable.

Say, x is 100 pounds. Say y% is 50% i.e. the solution had 50 pounds of sugar and 50 pounds of water.

20% water evaporates so

\frac{20}{100} \times 50 = 10

pounds of water evaporates leaving 40 pounds of water.…

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What this question tests

What it tests

Your ability to apply GMAT math concepts to solve a multi-step problem quickly and accurately. At the 705-805 level, accuracy and speed both matter.

Common trap

Overcomplicating the setup — most GMAT problems reward a direct, organized approach over brute calculation.