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  3. The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are

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问题    The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether
   Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
   Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
   Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
   Ｄ. EACH statement ALONE is sufficient.
   Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.
A certain salad dressing made only of oil and vinegar is premixed and sold in the grocery store. What is the ratio of oil to vinegar in the mix?
   (1) An 18.6-ounce bottle of the salad dressing contains 12.4 ounces of vinegar.
   (2) In a 32-ounce bottle of the salad dressing, there is half as much oil as there is vinegar.
选项
答案D
解析 alone is sufficient, because if there are 12.4 ounces of vinegar, then there are 18.6-12.4=6.2 ounces of off; 6.2/12.4=1:2.(2) alone is sufficient because it tells you directly that the ratio of oil to vinegar is 1:2.
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