Problem Solving - Inequality : GMAT Problem Solving (PS)
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Problem Solving - Inequality

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Problem Solving - Inequality [#permalink]

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New post 25 Jul 2010, 10:46
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A
B
C
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E

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67% (00:00) correct 33% (02:29) wrong based on 6 sessions

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The number of distinct values of x satisfying the equation lx+3l + lx-5l = 0 is

a. 1
b. 0
c. 2
d. 3
[Reveal] Spoiler: OA
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Re: Problem Solving - Inequality [#permalink]

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New post 25 Jul 2010, 11:00
0 should be the answer. By solving I got x=1, but this value doesn't satisfy the equation. So 0 for my.
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Re: Problem Solving - Inequality [#permalink]

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New post 25 Jul 2010, 11:02
EnterMatrix wrote:
The number of distinct values of x satisfying the equation mod(x+3) + mod(x-5) = 0 is

a. 1
b. 0
c. 2
d. 3


The above equation is only possible when both the mod's are zero

|a| + |b| = 0 only when a=b=0

this is possible when x = -3 and x=5 have common solution, but its not possible hence

B , 0 solution
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Re: Problem Solving - Inequality   [#permalink] 25 Jul 2010, 11:02
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