Official Guide Explanation:
Data Sufficiency #12




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Solution and Metadata

Question: 12
Page: 154
Difficulty: 3 (Very Easy)
Category 1: Word Problems > Other >

Explanation: Statement (1) is insufficient: it provides a comparison between what we're looking for and some other variable we don't know the value of (gross revenues during the first week). Statement (2) is also insufficient, comparing two variables, neither of which we know anything about, and neither of which are the one we're looking for.

Taken together, the statements are still insufficient. There are three variables: gross revenues in the first, second, and third weeks, and only two linear equations. Choice (E) is correct.

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