Question

Green 先生通过走过矩形花园的两条边来测量花园，发现它是 $15$ 步乘 $20$ 步。Green 先生每一步长 $2$ 英尺。他预计花园每平方英尺能收获半磅土豆。Green 先生预计能收获多少磅土豆？

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：560

解答：

花园尺寸为 $2\cdot 15 = 30$ 英尺和 $2\cdot 20=40$ 英尺，面积为 $30\cdot 40 = 1200$ 平方英尺。

预计收获磅土豆。 $1200\cdot \dfrac 12 =600$

所以正确答案是 A。

The dimensions of the garden are $2\cdot 15 = 30$ feet by $2\cdot 20=40$ feet. Thus, the square footage is $30\cdot 40 = 1200.$

Therefore, there are $1200\cdot \dfrac 12 =600$ pounds of potatoes.

Thus, the correct answer is A .

2013 AMC 10B 第 2 题

答案：A

难度评级：560

解答：

其他年份的第 2 题