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2A + 2B + 18 = 0 what is B?

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Source: — Data Sufficiency |

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by Jay@ManhattanReview » Thu Nov 23, 2017 9:25 pm
VJesus12 wrote:2A + 2B + 18 = 0, what is B?

(1) A = B
(2) A = 3

The OA is D .

I am confuse. How can I find B using statement (1)?
What is the source of this question? It does not seem to be a reliable source. The answers from each statement must be the same; however, it is not.

(1) A = B

By replacing the value of A = B in the equation 2A + 2B + 18 = 0.

2A + 2B + 18 = 0 => 2B + 2B + 18 = 0 => 4B = -18 => B = -9/2. Sufficient.

(2) A = 3

By replacing the value of A = 3 in the equation 2A + 2B + 18 = 0.

2A + 2B + 18 = 0 => 2*3 + 2B + 18 = 0 => 4B = -18 -6 => B = -24/4 = -6. Sufficient.

The correct answer: D

Hope this helps!

-Jay
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