AMC 8 2011 Problem 21
AMC8 2011 年第 21 题
整除与因数★★★★☆
Students guess that Norb's age is 24, 28, 30, 32, 36, 38, 41, 44, 47, and 49. Norb says, "At least half of you guessed too low, two of you are off by one, and my age is a prime number." How old is Norb?
学生猜测 Norb 的年龄是 24，28，30，32，36，38，41，44，47 和 49 岁。Norb 说："你们中至少有一半猜的太低，有 2 个同学猜的跟实际年龄相差 1 岁，并且我的年龄是个质数"。 那么 Norb 多大？
- A.29
- B.31
- C.37
- D.43
- E.48
正确答案 · Correct Answer
C
解析 · Solution
解析整理中
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