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Official Guide Explanation:
Data Sufficiency #93
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: 93
Page: 280
Difficulty: 5 (Moderate)
Category 1: Arithmetic > Descriptive Statistics > Average
Category 2: Arithmetic > Properties of Integers > Factors and Multiples
Explanation: While at first glance, this question has five variables, the fact that the variables are consecutive even integers simplifies matters. In fact, there is only one variable, and all the others can be expressed in terms of that one. The five are:
p,p + 2,p + 4,p + 6,p + 8
q = p + 2, and so on. The average of the five integers is the middle number (the median), as is the case whenever a set of numbers are equally spaced. Thus, if we can find p, we can find the median, p + 4.
Statement (1) is sufficient. q = p + 2, and s = p + 6, so we know that:
p + 2 + p + 6 = 24
2p + 8 = 24
2p = 16
p = 8
Statement (2) is also sufficient. Again, we can substitute expressions containing p for q and r:
q = p + 2
s = p + 4
(((p + 2) + (p + 4))/2) = 11
2p + 6 = 22
2p = 16
p = 8
Choice (D) is correct.
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