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## Official Guide Explanation:Data Sufficiency #43

Background

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Review (12th 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: 43
Page: 276
Difficulty: 4 (Moderately Easy)
Category 1: Arithmetic > Decimals >
Category 2: Arithmetic > Fractions >

Explanation: To find the tenths digit of a number, you don't need the exact number, but you do need a limited range of possible numbers. Statement (1) is insufficient: if the number is less than 0.33, the tenths digit could be 0, 1, 2, or 3. Statement (2) is also insufficient: if the number is greater than 0.25, the tenths digit could be 2 or any digit greater than 2.

Taken together, the statements are still insufficient: if the number is between 0.25 and 0.33, the tenths digit could be 2 or 3, so choice (E) is correct.

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