Question

Rachelle 用三磅肉为家人做八个汉堡。她要为社区野餐做二十四个汉堡，需要多少磅肉？

Rachelle uses 3 pounds of meat to make 8 hamburgers for her family. How many pounds of meat does she need to make 24 hamburgers for a neighborhood picnic?

$6$

$6\dfrac23$

$7\dfrac12$

$8$

$9$

答案：E

知识点：比与比例

难度评级：370

视频讲解：

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文字解答：

如果做 $8$ 个汉堡，就是做 $24$ 个汉堡的 $\dfrac{1}{3}$ 。这表示做 $3$ 磅肉也只是所需肉量的 $\dfrac{1}{3}$ 。因此总肉量为 $\dfrac{1}{\dfrac{1}{3}} \cdot 3 = 3\cdot3 = 9$ 。

所以正确答案是 E。

If we have $8$ hamburgers, we have $\dfrac{1}{3}$ of the $24$ hamburgers. This means we have $\dfrac{1}{3}$ of the meat when we have $3$ pounds. The total amount of meat is therefore $\dfrac{1}{\dfrac{1}{3}} \cdot 3 = 3\cdot3 = 9.$

Thus, the answer is E .

2012 AMC 8 第 1 题

答案：E

难度评级：370

视频讲解：

文字解答：

其他年份的第 1 题