2013 AMC 10B 第 2 题

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

小提示：

先把花园两边从步数换成英尺。

Convert each garden side from steps to feet

大提示：

面积再乘以每平方英尺半磅。

Multiply area by half a pound per square foot

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。

因此，预计收获

1200\cdot \dfrac 12 =600

磅土豆。

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

小提示：

大提示：

解答：

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