2001 AMC 8 第 20 题

先试着解答 2001 AMC 8 第 20 题,然后核对你的答案与精心整理的解答,解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2001 AMC 8 解答,或核对答案

所有题目均经美国数学协会(MAA)官方合法授权使用。

20.

Kaleana 把自己的考试分数给 Quay、Marty 和 Shana 看,但其他人都把自己的分数藏起来。Quay 想:“我们中至少有两个人分数相同。”Marty 想:“我不是最低分。”Shana 想:“我不是最高分。”按从低到高列出 Marty(M\text{M})、Quay(Q\text{Q})和 Shana(S\text{S})的分数。

Kaleana shows her test score to Quay, Marty and Shana, but the others keep theirs hidden. Quay thinks, "At least two of us have the same score." Marty thinks, "I didn't get the lowest score." Shana thinks, "I didn't get the highest score." List the scores from lowest to highest for Marty (M\text{M}), Quay (Q\text{Q}) and Shana (S\text{S}).

S,Q,M\text{S,Q,M}

Q,M,S\text{Q,M,S}

Q,S,M\text{Q,S,M}

M,S,Q\text{M,S,Q}

S,M,Q\text{S,M,Q}

答案:A
知识点:逻辑推理不等式
难度评级:1520
解答:

因为 Quay 只知道 Kaleana 的分数,所以 Quay 和 Kaleana 的分数相同,即 K=Q\text{K} = \text{Q}

Marty 知道他的分数高于 Kaleana,所以 M>K\text{M} \gt \text{K}。Shana 知道她的分数低于 Kaleana,所以 S<K\text{S} \lt \text{K}

Q\text{Q} 替换 K\text{K},得到 S<Q<M\text{S} \lt \text{Q} \lt \text{M}

所以正确答案是 A

Since Quay only knows Kaleana's score, we get that Quay and Kaleana have the same score, so K=Q.\text{K} = \text{Q}.

Marty knows that his score is higher than Kaleana's, so M>K.\text{M} \gt \text{K}. Shana knows that her score is lower than Kaleana's, so S<K.\text{S} \lt \text{K}.

Substituting Q\text{Q} for K,\text{K}, we get the following inequality: S<Q<M.\text{S} \lt \text{Q} \lt \text{M}.

Thus, A is the correct answer.

← 第 19 题#19
完整试卷

其他年份的第 20 题

1985 AMC 8 · 1986 AMC 8 · 1987 AMC 8 · 1988 AMC 8 · 1989 AMC 8 · 1990 AMC 8 · 1991 AMC 8 · 1992 AMC 8 · 1993 AMC 8 · 1994 AMC 8 · 1995 AMC 8 · 1996 AMC 8 · 1997 AMC 8 · 1998 AMC 8 · 1999 AMC 8 · 2000 AMC 8 · 2002 AMC 8 · 2003 AMC 8 · 2004 AMC 8 · 2005 AMC 8 · 2006 AMC 8 · 2007 AMC 8 · 2008 AMC 8 · 2009 AMC 8 · 2010 AMC 8 · 2011 AMC 8 · 2012 AMC 8 · 2013 AMC 8 · 2014 AMC 8 · 2015 AMC 8 · 2016 AMC 8 · 2017 AMC 8 · 2018 AMC 8 · 2019 AMC 8 · 2020 AMC 8 · 2022 AMC 8 · 2023 AMC 8 · 2024 AMC 8 · 2025 AMC 8 · 2026 AMC 8