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## Official Guide Explanation:

Problem Solving #16

**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.

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**Solution and Metadata**

**Question****: 16**

Page: 154

Difficulty: **4** (Moderately Easy)

Category 1: Geometry > Rectangular Solids and Cylinders > Rectangular Solids

Category 2: Word Problems > Geometry Problems >

**Explanation:** A rectangular solid's volume is expressed by the product of its length, width, and height, or v = lwh. If the sandbox has a capacity (another way of saying volume) of 10 cubic feet, then lwh = 10. If a similar sandbox doubled each of the measurements, the volume would be equivalent to (2l)(2w)(2h) = 8lwh. Since we know that lwh = 10, 8lwh = 8(10) = 80, choice (D).

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