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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
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Joined: 07 Jan 2011
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what is the value of B if a = b/c^2 ? 1) ac^2 = 50 2) c^2 = [#permalink] New post 12 May 2011, 09:50
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A
B
C
D
E

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  5% (low)

Question Stats:

100% (01:24) correct 0% (00:00) wrong based on 15 sessions
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 :-D I selected "D" didnt notice the second part in the sentenace. :-D
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Re: Kaplan tricky question [#permalink] New post 12 May 2011, 16:03
(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

Answer - A
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Director
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Re: Kaplan tricky question [#permalink] New post 12 May 2011, 16:08
1. Sufficient

b =ac^2 = 50

2. Not sufficient.

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

so b = +50 or b = -50

Answer is A.
Senior Manager
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Joined: 09 Feb 2011
Posts: 285
Concentration: General Management, Social Entrepreneurship
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Re: Kaplan tricky question [#permalink] New post 12 May 2011, 20:39
Two possible values make B wrong, no such problem with A
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Re: Kaplan tricky question [#permalink] New post 13 May 2011, 01:07
A is clean.

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

Hence A
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Re: Kaplan tricky question   [#permalink] 13 May 2011, 01:07
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