Question

Green 先生通过沿着长方形花园的两条边走路来测量花园，发现它是 $15$ 步乘 $20$ 步。他每一步长 $2$ 英尺。Green 先生预计花园每平方英尺能产半磅土豆。他预计花园能产多少磅土豆？

Mr. Green measures his rectangular garden by walking two of the sides and finds that it is $15$ steps by $20$ steps. Each of Mr. Green's steps is $2$ 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?

$600$

$800$

$1000$

$1200$

$1400$

答案：A

知识点：单位换算面积速率

难度评级：1020

解答：

花园的长和宽分别为 $2\cdot 15 = 30$ 英尺和 $2\cdot 20 = 40$ 英尺，面积为 $1200$ 平方英尺。每平方英尺能产半磅土豆，所以预计产量为 $\tfrac12\cdot 1200 = 600$ 磅。正确答案是 A。

The garden is $2\cdot 15 = 30$ feet by $2\cdot 20 = 40$ feet, an area of $1200$ square feet. At half a pound per square foot, Mr. Green expects $\tfrac12\cdot 1200 = 600$ pounds. Thus, the correct answer is A.

2013 AMC 12B 第 2 题

答案：A

难度评级：1020

解答：

其他年份的第 2 题