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Q29 of M13

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Q29 of M13 [#permalink] New post 08 Feb 2010, 08:18
Can anyone explain the solution of this problem.

What was Silvia's income in December?

1. Silvia's income in December was $50 more than her average monthly income during the year.
2. Silvia's income in December was twice her average monthly income during the year.

(C) 2008 GMAT Club - m13#29

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient
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Senior Manager
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Re: Q29 of M13 [#permalink] New post 08 Feb 2010, 15:29
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Lets say Average income during the year is A
and income in December is D

If statement 1 is taken => D = A + 50 (1 alone not sufficient)

If statement 2 is taken => D = 2*A (2 alone is not sufficient)

If considered both, solving the equations,
we get A = 50 therefore D = 100

So the answer is "C"
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
Re: Q29 of M13   [#permalink] 08 Feb 2010, 15:29
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Q29 of M13

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