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AMC8 2004

AMC8 2004 · Q1

AMC8 2004 · Q1. It mainly tests Ratios & proportions, Unit conversion.

On a map, a 12-centimeter length represents 72 kilometers. How many kilometers does a 17-centimeter length represent?
在地图上,12厘米长度代表72公里。那么17厘米长度代表多少公里?
(A) 6 6
(B) 102 102
(C) 204 204
(D) 864 864
(E) 1224 1224
Answer
Correct choice: (B)
正确答案:(B)
Solution
We set up the proportion $\frac{12 \text{cm}}{72 \text{km}}=\frac{17 \text{cm}}{x \text{km}}$. Thus $x=102 \Rightarrow \boxed{\textbf{(B)}\ 102}$
我们建立比例 $\frac{12 \text{cm}}{72 \text{km}}=\frac{17 \text{cm}}{x \text{km}}$。因此 $x=102 \Rightarrow \boxed{\textbf{(B)}\ 102}$
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