2013 AMC12B 真题

2013 AMC12B

Problem 1

On a particular January day, the high temperature in Lincoln, Nebraska, was degrees higher than the low temperature, and the average of the high and low temperatures was . In degrees, what was the low temperature in Lincoln that day?

内布拉斯加州林肯市在一月份的某天，高温比低温高 16 度，且高温和低温的平均值是 度， 3 问林肯市那天的低温是多少度 ?

Problem 2

Mr. Green measures his rectangular garden by walking two of the sides and finds that it is steps by steps. Each of Mr. Green's steps is feet long. Mr. Green expects a half a pound of potatoes per square foot from his garden. How many pounds of potatoes does Mr. Green expect from his garden?

格林先生通过用自己的步长来测量他的矩形花园，发现大小是 15 步 ｘ 20 步，格林先生的每 一步是 英尺长，他期望他的花园每平方英尺的土地可以产出半磅的土豆，问格林先生期望 2 他的花园总共可以产出多少磅的土豆 ?

(A) 600 (B) 800 (C) 1000 (D) 1200 (E) 1400

Problem 3

When counting from to , is the number counted. When counting backwards from to , is the number counted. What is ?

当从 数到 3 201 ，数到的第 51 个数是 53 ，当从 201 倒数到 ，数到的第 个数是 3 n 53 ，问 是 n 多少 ?

(A) 146 (B) 147 (C) 148 (D) 149 (E) 150