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## Official Guide Explanation:Data Sufficiency #17

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: 17
Page: 154
Difficulty: 4 (Moderately Easy)
Category 1: Arithmetic > Ratio and Proportion >
Category 2: Arithmetic > Percents > other

Explanation: Statement (1) is insufficient: without knowing the amount of money that came from corporate donations, the corresponding percent doesn't help. Statement (2) is insufficient: without knowing the percent corresponding to noncorporate donations, the dollar amount doesn't help.

Taken together, the statements are sufficient. If 40 percent came from corporate donations, then 60 percent came from noncorporation donations. If \$1.5 million came from noncorporate donations, then (0.6)t = 1.5, where t is the total dollar amount donated to the charity, in millions of dollars. You can solve for t, so choice (C) is correct.

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