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# DS - What is the value of b?

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Intern
Joined: 06 Jan 2004
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DS - What is the value of b? [#permalink]  18 Sep 2005, 07:23
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:54) correct 0% (00:00) wrong based on 2 sessions
This is a data suffiency question.

If 2b - 2a^2 = 18, what is the value of b?

1. a^2 = 1156

2. a> 0

Which statement is suffiencient to answer the question?

Thanks
Manager
Joined: 06 Aug 2005
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1. is sufficient. A

Since (1) gives you a^2, the sign of a isn't needed to answer the question.
But (2) alone gives you a range for b.
Senior Manager
Joined: 22 Jun 2005
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Location: London
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I'd pick A

Statement 1 gives you a^2=1156.
Just substitue that into the equation and you'll get a value for b.

2. Insufficient, you only know that a is greater than 0. a could be anything
so you cannot solve for b.

If 2b - 2a^2 = 18, what is the value of b?

1. a^2 = 1156

2. a> 0
Intern
Joined: 19 Aug 2005
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A clearly

same raesoning as others
VP
Joined: 13 Jun 2004
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Location: London, UK
Schools: Tuck'08
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A.

You just need A^2 to find B so no need of statement 2
Intern
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Re: DS - What is the value of b? [#permalink]  20 Sep 2005, 21:59
sundarman wrote:
This is a data suffiency question.

If 2b - 2a^2 = 18, what is the value of b?

1. a^2 = 1156

2. a> 0

Which statement is suffiencient to answer the question?

Thanks

Since we have (1) as a^2=1156, we can substitute the value and have the answer.

Definetely, A is the pick
Re: DS - What is the value of b?   [#permalink] 20 Sep 2005, 21:59
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