2. 外语
  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.
At a certain pancake festival with 600 attendees in which every attendee ate at least 1 pancake, how many people had only 1 pancake?
   (1) At the festival there were 1,200 pancakes served, and no person had more than 3 pancakes.
   (2) Seventy-two percent of the attendees at the festival had 2 or more pancakes.
选项
答案B
解析 alone is not sufficient, because there could have been 300 people who had 1 pancake and 300 people who had 3 pancakes, or 600 people who had 2 pancakes. (2) alone is sufficient, because you can directly infer from the statement that 100%-72%=28% of attendees, or 168, had only 1 pancake.
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