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If a=b/c and b=a/c, then c=

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Intern
Intern
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B
Joined: 29 May 2016
Posts: 10
If a=b/c and b=a/c, then c=  [#permalink]

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New post 20 Jul 2018, 13:15
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

82% (00:56) correct 18% (00:35) wrong based on 11 sessions

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If a=b/c and b=a/c, then c=

A. b/a
B. a/b
C. -1
D. a
E. -b

Source: Nova's GMAT Prep Course
Director
Director
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G
Joined: 20 Feb 2015
Posts: 743
Concentration: Strategy, General Management
Premium Member
Re: If a=b/c and b=a/c, then c=  [#permalink]

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New post 20 Jul 2018, 15:04
Xin Cho wrote:
If a=b/c and b=a/c, then c=

A. b/a
B. a/b
C. -1
D. a
E. -b

Source: Nova's GMAT Prep Course


ac=a/c
c^2=1
c=+-1
C
Intern
Intern
avatar
B
Joined: 29 May 2016
Posts: 10
Re: If a=b/c and b=a/c, then c=  [#permalink]

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New post 20 Jul 2018, 23:54
CounterSniper wrote:
Xin Cho wrote:
If a=b/c and b=a/c, then c=

A. b/a
B. a/b
C. -1
D. a
E. -b

Source: Nova's GMAT Prep Course


ac=a/c
c^2=1
c=+-1
C


Could you please explain why A. or B. is not possible solution? 1. a=b/c => ca=b => c=a/b AND 2 b=a/c => cb=a => cb/a.
Math Expert
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V
Joined: 02 Sep 2009
Posts: 49496
Re: If a=b/c and b=a/c, then c=  [#permalink]

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New post 21 Jul 2018, 00:32
GMAT Club Bot
Re: If a=b/c and b=a/c, then c= &nbs [#permalink] 21 Jul 2018, 00:32
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