AMC 8 1995 Problem 7

AMC8 1995 年第 7 题

比与比例★★☆☆☆

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?

在 Clover View 初中，二分之一的学生乘校车回家，四分之一乘汽车回家，十分之一骑自行车回家，其余步行回家。步行的学生占几分之几？

A. $\dfrac{1}{16}$
B. $\dfrac{3}{20}$
C. $\dfrac{1}{3}$
D. $\dfrac{17}{20}$
E. $\dfrac{9}{10}$

正确答案 · Correct Answer

解析 · Solution

Solution 1

The students who walk home are

\displaystyle 1 - \frac{1}{2} - \frac{1}{4} - \frac{1}{10} = \frac{1}{2} - \frac{1}{4} - \frac{1}{10} = \frac{1}{4} - \frac{1}{10} = \frac{5}{20} - \frac{2}{20} = \frac{3}{20}

of the entire student population. Therefore, the answer is

B

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