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## Official Guide Explanation:Data Sufficiency #53

Background

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Quantitative Review (2nd ed.). Click the links on the question number, difficulty level, and categories to find explanations for other problems.

These are the same explanations that are featured in my "Guides to the Official Guide" PDF booklets. However, because of the limitations of HTML and cross-browser compatibility, some mathematical concepts, such as fractions and roots, do not display as clearly online.

Question: 53
Page: 156
Difficulty: 5 (Moderate)
Category 1: Word Problems > Other >
Category 2: Arithmetic > Percents > Percent Change
Category 3: Algebra > Linear Equations-Two Unk >

Explanation: To find the number of unemployed in June of that year, we need some equation to translate a percent to a number. Statement (1) is sufficient: 8.4 percent of the labor force was unemployed in May, a percent equal to 3.36 million. From there, you can find the total size of the labor force, which is the same as it is in June. Statement (2) is also sufficient: the difference between the percent of unemployed men in June and the number in May was 0.3% of the labor force, a percent equal to 120,000. From there, you can find the total size of the labor force. Choice (D) is correct.

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