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# Q29 of M13

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Joined: 15 Nov 2009
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Q29 of M13 [#permalink]

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08 Feb 2010, 09:18
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
Senior Manager
Joined: 28 Jun 2009
Posts: 445
Location: United States (MA)
Followers: 18

Kudos [?]: 176 [1] , given: 46

Re: Q29 of M13 [#permalink]

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08 Feb 2010, 16:29
1
KUDOS
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, 16:29
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# Q29 of M13

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