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GMAT Diagnostic Test Question 42

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Expert Post
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Affiliations: UA-1K, SPG-G, HH-D
Joined: 04 Dec 2002
Posts: 12007
Location: United States (WA)
GMAT 1: 750 Q49 V42
GPA: 3.5
WE: Information Technology (Hospitality and Tourism)
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GMAT Diagnostic Test Question 42 [#permalink] New post 29 Sep 2013, 21:00
Expert's post
1
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BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  65% (medium)

Question Stats:

29% (02:18) correct 71% (00:36) wrong based on 145 sessions

GMAT Diagnostic Test Question 42

Field: Algebra
Difficulty: 700


If x is an integer and 9<x^2<99, then what is the value of maximum possible value of x minus minimum possible value of x?
A. 5
B. 6
C. 7
D. 18
E. 20
[Reveal] Spoiler: OA

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Expert Post
2 KUDOS received
Founder
Founder
User avatar
Affiliations: UA-1K, SPG-G, HH-D
Joined: 04 Dec 2002
Posts: 12007
Location: United States (WA)
GMAT 1: 750 Q49 V42
GPA: 3.5
WE: Information Technology (Hospitality and Tourism)
Followers: 2156

Kudos [?]: 7548 [2] , given: 3623

GMAT ToolKit User Premium Member CAT Tests
Re: GMAT Diagnostic Test Question 42 [#permalink] New post 29 Sep 2013, 21:01
2
This post received
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Expert's post
Explanation
Official Answer: D

Notice that x can take positive, as well as negative values to satisfy 9<x^2<99, hence x can be: -9, -8, -7, -6, -5, -4, 4, 5, 6, 7, 8, or 9. We asked to find the value of x_{max}-x_{min}, ans since x_{max}=9 and x_{min}=-9 then x_{max}-x_{min}=9-(-9)=18.

Answer: D.
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Re: GMAT Diagnostic Test Question 42   [#permalink] 29 Sep 2013, 21:01
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