AMC8 2020

AMC8 2020 · Q2

AMC8 2020 · Q2. It mainly tests Averages (mean), Arithmetic misc.

Four friends do yardwork for their neighbors over the weekend, earning $\$15, \$20, \$25,$ and $\$40,$ respectively. They decide to split their earnings equally among themselves. In total, how much will the friend who earned $\$40$ give to the others?

四个朋友周末为邻居做院子工作，分别赚了 $\$$15、$\$$20、$\$$25 和 $\$$40。他们决定平分他们的收入。总共，赚了 $\$$40 的那个朋友需要给其他人多少钱？

(A) \$5 \$5

(B) \$10 \$10

(D) \$20 \$20

(E) \$25 \$25

Answer

Correct choice: (C)

正确答案：（C）

Solution

The friends earn $\$\left(15+20+25+40\right)=\$100$ in total. Since they decided to split their earnings equally, it follows that each person will get $\$\left(\frac{100}{4}\right)=\$25$. Since the friend who earned $\$40$ will need to leave with $\$25$, he will have to give $\$\left(40-25\right)=\boxed{\textbf{(C) }\$15}$ to the others.

朋友们总共赚了 $\$$\left(15+20+25+40\right)=\$$100。因为他们决定平分收入，所以每个人将得到 $\$$\left(\frac{100}{4}\right)=\$$25。赚了 $\$$40 的朋友需要带走 $\$$25，所以他必须给其他人 $\$$\left(40-25\right)=\boxed{\textbf{(C) }\$15}$。

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