Question

Walter 开到加油泵前时，注意到油箱是 $\dfrac18$ 满。他用十美元买了 $7.5$ 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

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

解答：

其他年份的第 10 题