Question

一条高速公路的第三个出口在 $40$ 英里标处，第十个出口在 $160$ 英里标处。一个服务中心位于从第三个出口到第十个出口路程的四分之三处。这个服务中心应在多少英里标处？

The third exit on a highway is located at milepost $40$ and the tenth exit is at milepost $160.$ There is a service center on the highway located three-fourths of the way from the third exit to the tenth exit. At what milepost would you expect to find this service center?

$90$

$100$

$110$

$120$

$130$

答案：E

知识点：分数

难度评级：900

解答：

第三个和第十个出口之间相差 $160 - 40 = 120$ 英里。

这意味着全程的 $\frac{3}{4}$ 处的英里标为 $40 + \dfrac{3}{4} \cdot 120 = 130$

所以正确答案是 E。

There are $160 - 40 = 120$ miles between the third and tenth exits.

This means $\frac{3}{4}$ of the way is at the $40 + \dfrac{3}{4} \cdot 120 = 130$ milepost.

Thus, E is the correct answer.

1999 AMC 8 第 7 题

答案：E

难度评级：900

解答：

其他年份的第 7 题