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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.
Stanley has gained 8 pounds a year ever since he turned 18. How much weight has Stanley gained since he turned 18?
   (1) Stanley now weighs twice what he weighed when he turned 18.
   (2) Stanley is now twice the age he was when he turned 18.
选项
答案B
解析 alone is insufficient because it does not tell us what Stanley weighed when he turned 18. (2) alone is sufficient, because it tells us that he has aged 18 years since then, meaning that he has gained 18×8 pounds=144 pounds.
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