Question

Walter 开到加油泵前时，注意到油箱是 $\dfrac18$ 满。他用 $\$10$ 买了 $7.5$ 加仑汽油。加完后，油箱变为 $\dfrac58$ 满。这个油箱装满时能容纳多少加仑汽油？

When Walter drove up to the gasoline pump, he noticed that his gasoline tank was $\dfrac18$ full. He purchased $7.5$ gallons of gasoline for $\$10.$ With this additional gasoline, his gasoline tank was then $\dfrac58$ full. The number of gallons of gasoline his tank holds when it is full is

$8.75$

$10$

$11.5$

$15$

$22.5$

答案：D

知识点：分数比与比例

难度评级：860

小提示：

从 $\dfrac18$ 满到 $\dfrac58$ 满，增加了 $\dfrac12$ 个油箱。

Going from $\dfrac18$ to $\dfrac58$ full is an increase of $\dfrac12$ of a tank

大提示：

如果半个油箱是 $7.5$ 加仑，那么一个满油箱是它的两倍。

If half a tank is $7.5$ gallons, double it for a full tank

解答：

增加量是 $\dfrac58 - \dfrac18 = \dfrac12$ 个油箱，对应 $7.5$ 加仑。

因此满油箱容量为 $2 \cdot 7.5 = 15$ 加仑。

所以正确答案是 D。

The increase is $\dfrac58 - \dfrac18 = \dfrac12$ of a tank, which equals $7.5$ gallons.

So a full tank holds $2 \cdot 7.5 = 15$ gallons.

Thus, the correct answer is D .

1996 AMC 8 第 10 题

答案：D

难度评级：860

小提示：

大提示：

解答：

其他年份的第 10 题