Question

在 Clover View Junior High，一半学生乘校车回家，四分之一乘汽车回家，十分之一骑自行车回家。其余学生步行回家。步行回家的学生占全体的几分之几？

At Clover View Junior High, one half of the students go home on the school bus. One fourth go home by automobile. One tenth go home on their bicycles. The rest walk home. What fractional part of the students walk home?

$\dfrac{1}{16}$

$\dfrac{3}{20}$

$\dfrac13$

$\dfrac{17}{20}$

$\dfrac{9}{10}$

答案：B

知识点：分数

难度评级：730

解答：

乘车或骑车的学生占

$\begin{aligned} \dfrac12 + \dfrac14 + \dfrac{1}{10} &= \dfrac{10}{20} + \dfrac{5}{20} + \dfrac{2}{20} \\ &= \dfrac{17}{20}. \end{aligned}$

所以步行的比例是 $1 - \dfrac{17}{20} = \dfrac{3}{20}$ 。

所以正确答案是 B。

The students who ride make up

$\begin{aligned} \dfrac12 + \dfrac14 + \dfrac{1}{10} &= \dfrac{10}{20} + \dfrac{5}{20} + \dfrac{2}{20} \\ &= \dfrac{17}{20}. \end{aligned}$

So the fraction who walk is $1 - \dfrac{17}{20} = \dfrac{3}{20}.$

Thus, the correct answer is B .

1995 AMC 8 第 7 题

答案：B

难度评级：730

解答：

其他年份的第 7 题