AMC 8 2012 Problem 1

AMC8 2012 年第 1 题

比与比例★☆☆☆☆

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 neighbourhood picnic?

Rachelle 用 3 磅肉为她的家人做了 8 个汉堡包。那么为邻里野餐做 24 个汉堡包需要多少磅肉？

A. $\hspace{.05in}6$
B. $\displaystyle \hspace{.05in}6\frac{2}3$
C. $\displaystyle \hspace{.05in}7\frac{1}2$
D. $\hspace{.05in}8$
E. $\hspace{.05in}9$

正确答案 · Correct Answer

解析 · Solution

Solution 1

Since Rachelle uses 3 pounds of meat to make 8 hamburgers, she uses

\displaystyle \frac{3}{8}

pounds of meat to make one hamburger. She'll need 24 times that amount of meat for 24 hamburgers, or

\displaystyle \frac{3}{8} \cdot 24 = 9

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