2012 AMC12A 真题

2012 AMC12A

Problem 1

A bug crawls along a number line, starting at . It crawls to , then turns around and crawls to . How many units does the bug crawl altogether?

一个虫子从 这个点开始沿着数轴爬行，它先爬到 ，然后掉头再爬到 ，那么这只虫子总 共爬了多长？

(A) 9 (B) 11 (C) 13 (D) 14 (E) 15

Problem 2

Cagney can frost a cupcake every seconds and Lacey can frost a cupcake every seconds. Working together, how many cupcakes can they frost in minutes?

Cagney 每 20 秒可以给一个蛋糕上霜， Lacey 每 30 秒可以给一个蛋糕上霜，若他俩合作，那么 5 分钟内可以给多少个蛋糕上霜？

(A) 10 (B) 15 (C) 20 (D) 25 (E) 30

Problem 3

A box centimeters high, centimeters wide, and centimeters long can hold grams of clay. A second box with twice the height, three times the width, and the same length as the first box can hold grams of clay. What is ?

一个 2 厘米高， 厘米宽， 厘米长的盒子能够装 3 5 40 克的泥土。第二个盒子高度和宽度分别是 前一个盒子的 2 倍和 3 倍，长度和前一个盒子一样长，可以装 n 克的泥土，问 n 是多少？

(A) 120 (B) 160 (C) 200 (D) 240 (E) 280