AMC8 1995

AMC8 1995 · Q4

AMC8 1995 · Q4. It mainly tests Word problems (algebra).

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，再将结果加倍。把答案给你的伙伴。伙伴，从你得到的数中减1，再将结果加倍得到你的答案。” 本想的是6，把他的答案给了苏。苏的答案应该是多少？

(A) 18 18

(B) 24 24

(D) 27 27

(E) 30 30

Answer

Correct choice: (C)

正确答案：（C）

Solution

Ben adds 1 to 6 to get 7, and then doubles 7 to get 14. Sue subtracts 1 from 14 to get 13, and then doubles 13 to get 26.

本将6加1得到7，然后将7加倍得到14。苏从14减1得到13，然后将13加倍得到26。

Topics

AL.017 Word problems (algebra)