Question

三所中学的学生参加了一个暑期项目。艾伦中学的七名学生工作了 $3$ 天。巴尔博亚中学的四名学生工作了 $5$ 天。卡弗中学的五名学生工作了 $9$ 天。学生工作的总报酬为 $\$774$ 。假设每名学生每天获得相同报酬，那么巴尔博亚中学的学生总共赚了多少？

Students from three middle schools worked on a summer project. Seven students from Allen School worked for $3$ days. Four students from Balboa School worked for $5$ days. Five students from Carver School worked for $9$ days. The total amount paid for the students’ work was $\$774.$ Assuming each student received the same amount for a day’s work, how much did the students from Balboa School earn altogether?

$\$9.00$

$\$48.38$

$\$180.00$

$\$193.50$

$\$258.00$

答案：C

知识点：速率

难度评级：1090

小提示：

计算三所学校学生合计的工作量（以“人天”为单位）

Compute the total number of student-days worked across all three schools

大提示：

用 $\$774$ 除以总人天数，得到每人每天的报酬

Divide $\$774$ by the total student-days to get the pay per student-day

解答：

总工作量为 $7 \times 3 + 4 \times 5 + 5 \times 9$ $= 21 + 20 + 45$ $= 86$ 人天。

所以每人每天的报酬为 $\$774 \div 86 = \$9$ 。巴尔博亚学生的总工作量为 $20$ 人天，共赚得 $20 \times \$9 = \$180$ 。

所以正确答案是 C。

The total student-days are $7 \times 3 + 4 \times 5 + 5 \times 9$ $= 21 + 20 + 45$ $= 86.$

So each student-day pays $\$774 \div 86 = \$9.$ Balboa worked $20$ student-days, earning $20 \times \$9 = \$180.$

Thus, the correct answer is C .

1995 AMC 8 第 16 题

答案：C

难度评级：1090

小提示：

大提示：

解答：

其他年份的第 16 题