小朋友身高

richard1987 · 发表于 2011-1-6 00:40:36

196. ds，一个幼儿园，小盆友Ａ在所有人的65％里面最高，问小盆友Ａ的身高：
（1）其余的（35％）小盆友的最小身高是19；
（2）这65％小盆友中至少一个身高是19。
狗主人表示：我选Ｃ
思路：
支持狗主人答案。
条件一：相当于只给出了范围上限，不充分。
条件二：给出了范围中的一个数，不充分。
两条件结合，充分，选C。

这题真是没有看懂了...问题好像也不明了

sdcar2010 · 发表于 2011-1-6 00:45:28

A is the tallest among 65% of the students, but not taller than the other 35% students.

1) The shortest guy in the other 35% students is at least 19. Insufficient. A could be 19, 18, 17 ...
2) At least one of the 65% student group A is in has a height of 19. In sufficient. A coud be 19, 20, 21 ...

Combined together, A can only be 19. Sufficient.

richard1987 · 发表于 2011-1-6 00:57:03

A is the tallest among 65% of the students, but not taller than the other 35% students.

1) The shortest guy in the other 35% students is at least 19. Insufficient. A could be 19, 18, 17 ...
2) At least one of the 65% student group A is in has a height of 19. In sufficient. A coud be 19, 20, 21 ...

Combined together, A can only be 19. Sufficient.

-- by 会员 sdcar2010 (2011/1/6 0:45:28)

According to your 1), why A could not be 20,21,22...? I don't think A's stature has anything to do with the shortest kid in the other 35% students.

In your 2), also, why A could not be 18,17,16? I don't think A's stature has anything to do with the premise.

Thank you and looking forward to your reply.

sdcar2010 · 发表于 2011-1-6 01:05:05

小盆友Ａ在所有人的65％里面最高

Translation: A is taller than 65% of the students, but shorter than the other 35%.

sdcar2010 · 发表于 2011-1-6 01:07:55

According to your 1), why A could not be 20,21,22...? I don't think A's stature has anything to do with the shortest kid in the other 35% students.

A could not be taller than 19. Because the shortest guy in the other 35% has to be taller than A.

sdcar2010 · 发表于 2011-1-6 01:09:39

In your 2), also, why A could not be 18,17,16? I don't think A's stature has anything to do with the premise.

In 2) there is at least one guy in A's group whose height is 19. If A is shorter than 19, then that 19 height guy is taller than A. This is contrary to the premise that A is the tallest in A's group.

小朋友身高

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