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DS - What is the value of b?

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DS - What is the value of b? [#permalink] New post 18 Sep 2005, 08:23
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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
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 [#permalink] New post 18 Sep 2005, 09:10
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.
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 [#permalink] New post 18 Sep 2005, 10:35
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
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 [#permalink] New post 18 Sep 2005, 21:43
A clearly

same raesoning as others
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 [#permalink] New post 19 Sep 2005, 03:24
A.

You just need A^2 to find B so no need of statement 2
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Re: DS - What is the value of b? [#permalink] New post 20 Sep 2005, 22:59
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, 22:59
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