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 Post subject: Geometry (Vol. VI), Question #44.Posted: Sat Oct 30, 2010 1:01 pm

Joined: Thu Jul 01, 2010 12:05 am
Posts: 35
This data sufficiency question asks the following: "What fractional part of the total surface area of cube C is red?"

(1) Each of 3 faces of C is exactly 1/2 red.
(2) Each of 3 faces of C is entirely white.

The correct answer is C, because you need both information to conclusively answer the question. I chose answer A because I felt that the first statement was sufficient to answer the question about the fraction of cube C's surface area being red. Is my error an example of a technique mentioned in the Data Sufficiency chapter

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 Post subject: Re: Geometry (Vol. VI), Question #44.Posted: Mon Nov 08, 2010 10:32 am

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
It's really just a GMAT trick.
They tell you that 3 of the faces are exactly 1/2 red.
However, we don't know anything about the other three faces, and so we can't answer the question.

Veritas Prep

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