Official Guide Explanation:
Data Sufficiency #22

Background

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Solution and Metadata

Question: 22
Page: 274
Difficulty: 3 (Very Easy)
Category 1: Word Problems > Other >

Explanation: There are four variables implied by the question: the cost and number of ounces of the regular - size box, and the cost and number of ounces of the family - size box. We're looking for the ratio of the last two.

Statement (1) is insufficient. It gives us a relationship between the number of ounces in the two boxes, but nothing about cost.

Statement (2) is also insufficient. It gives us the cost of the family - size box, but nothing about the number of ounces.

Taken together, the statements are still insufficient. For the cost per ounce of the family - size box, we would need both the price (which (2) gives us) and the number of ounces. We know only that the family - size box has 10 more ounces than the regular - size box, but not an actual number of ounces. Choice (E) is correct.

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