2. 外语
  3. A certain number of people wait in line at a bank until served. How many people are presently in line? (1) If 2 more people join

A certain number of people wait in line at a bank until served. How many people are presently in line? (1) If 2 more people join

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问题 A certain number of people wait in line at a bank until served. How many people are presently in line?
(1) If 2 more people joined the line and none of those currently waiting were served, there would be at least 10 people waiting in line.
(2) If no more people joined the line and 4 of the people currently waiting were served, there would be fewer than 5 people waiting in line.
选项 A、Statement (1) ALONE is sufficient, but statement (25) alone is not sufficient to answer the question asked.
B、Statement (2) ALONE is sufficient, but statement (24) alone is not sufficient to answer the question asked.
C、BOTH statement (1) and (25) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient to answer the question asked.
E、Statement (1) and(25)TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
答案C
解析 设队中原有x人，Statement (1)，如果队列中再加入2人，那么队中至少有10人，我们得到：x+2≥10，x≥8，但是队列中原来有几人是不知道的。Statement (2)，如果没有人加入，但是有4个人被服务，那么还剩下小于5人，也就是x-4＜5，x＜9，也无法回答问题。把(1)和(2)结合起来，得到x=8，回答了问题，所以C为正确答案。
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