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# what is the value of B if a = b/c^2 ? 1) ac^2 = 50 2) c^2 =

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Intern
Joined: 07 Jan 2011
Posts: 25

Kudos [?]: 4 [0], given: 4

what is the value of B if a = b/c^2 ? 1) ac^2 = 50 2) c^2 = [#permalink]

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12 May 2011, 10:50
00:00

Difficulty:

25% (medium)

Question Stats:

100% (00:25) correct 0% (00:00) wrong based on 18 sessions

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what is the value of B if a = b/c^2 ?

1) ac^2 = 50
2) c^2 = 10 and a^2 = 25.

small mistake cause one question wrong in DS I selected "D" didnt notice the second part in the sentenace.
[Reveal] Spoiler: OA

Kudos [?]: 4 [0], given: 4

SVP
Joined: 16 Nov 2010
Posts: 1594

Kudos [?]: 592 [0], given: 36

Location: United States (IN)
Concentration: Strategy, Technology

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12 May 2011, 17:03
(1)

aC^2 = b

=> b = 50

Sufficient

(2)

c^2 = 10

but a^2 = 25

=> a = 5 or -5

So b = -50 or 50

Insufficient

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Kudos [?]: 592 [0], given: 36

Director
Joined: 01 Feb 2011
Posts: 726

Kudos [?]: 144 [0], given: 42

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12 May 2011, 17:08
1. Sufficient

$$b =ac^2$$ = 50

2. Not sufficient.

a =+5 or -5 , c^2 = 10

so b = +50 or b = -50

Kudos [?]: 144 [0], given: 42

Senior Manager
Joined: 09 Feb 2011
Posts: 272

Kudos [?]: 214 [0], given: 13

Concentration: General Management, Social Entrepreneurship
Schools: HBS '14 (A)
GMAT 1: 770 Q50 V47

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12 May 2011, 21:39
Two possible values make B wrong, no such problem with A

Kudos [?]: 214 [0], given: 13

VP
Status: There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Joined: 08 May 2009
Posts: 1285

Kudos [?]: 283 [0], given: 10

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13 May 2011, 02:07
A is clean.

B a= +|- 5 and c = +|- 10^(1/2)

Hence A
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Kudos [?]: 283 [0], given: 10

Re: Kaplan tricky question   [#permalink] 13 May 2011, 02:07
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