Math questions from any Manhattan Prep GMAT Computer Adaptive Test.
julia.gilroy
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If x is not equal to 0, is the absolute value of x less than

by julia.gilroy Fri Jul 31, 2009 5:39 pm

If x is not equal to 0, is |x| less than 1?

(1) x/|x|< x

(2) |x| > x

(1) INSUFFICIENT: If x > 0, this statement tells us that x > x/x or x > 1. If x < 0, this
statement tells us that x > x/-x or x > -1. This is not enough to tell us if -1 < x < 1.


I am having difficulty understanding the provided explanation for statement 1. Why is it that if x<0, x> x/-x? If x<0, shouldn't the inequality be -x>-x/-x?
www.mbachase.com
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Re: If x is not equal to 0, is the absolute value of x less than

by www.mbachase.com Wed Aug 12, 2009 2:25 am

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Ben Ku
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Re: If x is not equal to 0, is the absolute value of x less than

by Ben Ku Tue Aug 18, 2009 1:48 pm

Hi Judy,

When dealing with absolute values, |x| = x if x is positive, and |x|=-x if x is negative.

If we look at (1), if x is negative, then x/(-x)< x, so -1 < x. I think the confusion is because the explanation switches the left and right sides, writing "x > x/-x", which of course is the same thing.

Hope that helps.
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yousuf_azim
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Re: If x is not equal to 0, is the absolute value of x less than

by yousuf_azim Sat Sep 24, 2011 11:54 pm

Hello,

What is the ans?

BR
StaceyKoprince
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Re: If x is not equal to 0, is the absolute value of x less than

by StaceyKoprince Fri Nov 11, 2011 9:55 pm

the answer is C
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