Question

一个儿童浅水池中有 $200$ 加仑水。如果水以每天 $0.5$ 加仑的速度蒸发，且没有其他水加入或取出，那么 $30$ 天后池中还有多少加仑水？

A child's wading pool contains $200$ gallons of water. If water evaporates at the rate of $0.5$ gallons per day and no other water is added or removed, how many gallons of water will be in the pool after $30$ days?

$140$

$170$

$185$

$198.5$

$199.85$

答案：C

知识点：速率

难度评级：730

解答：

蒸发掉的水量是 $0.5\cdot 30=15$ 加仑，所以剩余水量为 $200-15=185.$

所以正确答案是 C。

The amount lost is $0.5\cdot 30=15$ gallons. Therefore, the amount left is $200-15=185.$

Thus, the correct answer is C .

1998 AMC 8 第 8 题

答案：C

难度评级：730

解答：

其他年份的第 8 题