AMC 8 1995 Problem 4
AMC8 1995 年第 4 题
表达式与运算★☆☆☆☆
A teacher tells the class, "Think of a number, add 1 to it, and double the result. Give the answer to your partner. Partner, subtract 1 from the number you are given and double the result to get your answer." Ben thinks of 6 , and gives his answer to Sue. What should Sue's answer be?
老师对全班说：
"想一个数，加 1，然后将结果加倍。把答案告诉你的搭档。搭档，将你得到的数减 1，然后将结果加倍得出你的答案。"
Ben 想了 6，并将他的答案告诉了 Sue。Sue 的答案应是多少？
- A.18
- B.24
- C.26
- D.27
- E.30
正确答案 · Correct Answer
C
解析 · Solution
Solution 1
Ben adds 1 to 6, getting 1 + 6 = 7. Then Ben doubles it, to get . He gives this number to Sue. Then Sue subtracts 1 from the number, to get 14 - 1 = 13. Finally, Sue doubles the result to get , and the answer is .
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