2020 AMC 8 第 2 题

先试着解答 2020 AMC 8 第 2 题,然后核对你的答案与视频与精心整理的解答,解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2020 AMC 8 解答,或核对答案。

所有题目均经美国数学协会(MAA)官方合法授权使用。

2.

四个朋友周末为邻居做院子活,分别赚了 $15\$15、$20\$20、$25\$25 和 $40\$40。他们决定把收入平均分给四个人。赚了 $40\$40 的朋友一共要给其他人多少钱?
Four friends do yardwork for their neighbors over the weekend, earning $15,\$15, $20,\$20, $25,\$25, and $40\$40 respectively. They decide to split their earnings equally among themselves. In total how much will the friend who earned $40\$40 give to the others?
$5\$5
$10\$10
$15\$15
$20\$20
$25\$25
答案:C
知识点:平均数钱币
小提示:
先求总收入平均到每个人是多少
Find the equal share of the total earnings
大提示:
赚 $40\$40 的人要给出超过平均份额的部分
The $40\$40 earner gives away the amount above the equal share
视频讲解:
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文字解答:
他们总共赚了 $15+$20+$25+$40=$100\$15+\$20+\$25+\$40=\$100。
平均分给四个人后,每人应得 1004=25\frac{100}{4}=25 美元。
因此,赚 $40\$40 的朋友要给其他人 $40−$25=$15\$40-\$25=\$15。
正确答案是 C。
First, the total amount of money that they make is $15+$20+$25+$40=$100.\$15+\$20+\$25+\$40=\$100.
Since they divide this equally, they each get 1004=25\frac{100}{4}=25 dollars.
The friend who earned $40\$40 therefore gives away $40−$25=$15.\$40-\$25=\$15.
Thus, the correct answer is C.
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