Question

$1980$ 年，美国黑人总人口（单位：百万）在东北部为 $5$ ，中西部为 $5$ ，南部为 $15$ ，西部为 $2$ 。按最接近的百分数计算，美国黑人总人口中有百分之多少住在南部？

In $1980,$ the U.S. Black population (in millions) was $5$ in the Northeast, $5$ in the Midwest, $15$ in the South, and $2$ in the West. To the nearest percent, what percent of the U.S. Black population lived in the South?

$20\%$

$25\%$

$40\%$

$56\%$

$80\%$

答案：D

知识点：百分数

难度评级：820

解答：

按百万人计，黑人总人口为 $5 + 5 + 15 + 2 = 27$ 。

南部所占比例是 $\dfrac{15}{27} = \dfrac59 \approx 55.6\%$ ，四舍五入为 $56\%$ 。

所以正确答案是 D。

The total Black population is $5 + 5 + 15 + 2 = 27$ million.

The South's share is $\dfrac{15}{27} = \dfrac59 \approx 55.6\%,$ which rounds to $56\%.$

Thus, the correct answer is D .

1987 AMC 8 第 23 题

答案：D

难度评级：820

解答：

其他年份的第 23 题