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Source: — Data Sufficiency |
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by GmatKiss » Thu Oct 27, 2011 1:21 am
IMO: E, what's the doubt?
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by Anurag@Gurome » Thu Oct 27, 2011 3:29 am
apshara5 wrote:What is the value of x?

(1) x + 2y = 4
(2) 5x + y + 15 = 3x - 3y + 23
Statement 1: One equation in two unknown is not enough to determine the value of x.

NOT sufficient


Statement 1: 5x + y + 15 = 3x - 3y + 23
---> (5x - 3x) + (y + 3y) + (15 - 23) = 0
---> 2x + 4y - 8 = 0
---> x + 2y - 4 = 0
---> x + 2y = 4 ------ Same as the equation in statement 1
One equation in two unknown is not enough to determine the value of x.

NOT sufficient

1 & 2 Together: No new information ---> NOT sufficient

The correct answer is E.
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