一道AMC的数学题,谁能帮忙解决一下5. At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 12, 15, and 10 minutes per day, respectively. There are twice as many third graders as fourth grade

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一道AMC的数学题,谁能帮忙解决一下5. At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 12, 15, and 10 minutes per day, respectively. There are twice as many third graders as fourth grade
一道AMC的数学题,谁能帮忙解决一下
5. At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 12, 15, and 10 minutes per day, respectively. There are twice as many third graders as fourth graders, and twice as many fourth graders as fifth graders. What is the average number of minutes run per day by these students?

一道AMC的数学题,谁能帮忙解决一下5. At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 12, 15, and 10 minutes per day, respectively. There are twice as many third graders as fourth grade
相信题目你看得懂,我就不翻译了.
设5年级有4人跑步,4年级有2人跑步,3年级有1人跑步.
跑步总时间：4×10+2×15+1×12=82（分）
每人平均时间：82÷（4+2+1）=82/7（分/天）

一道AMC的数学题,谁能帮忙解决一下5. At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 12, 15, and 10 minutes per day, respectively. There are twice as many third graders as fourth grade 帮忙解决一下数学题求帮忙解决一道参数方程的数学题谁能帮忙解决一下啊啊啊啊一道小学数学题,帮忙解决一下1993*19941994+1994*19931993=? 帮忙解决一下大一的一道理论力学题高手帮忙解决一下几道数学题! 数学题帮忙解决一下昂谢谢了谁能帮忙解决一下这道题啊?步骤详细点啊一道高中几何数学题,帮忙做一下. 小学一年级数学题谁能帮忙解答一下数学题大家帮忙解决帮忙解决一些数学题一分钟解决的一道数学题一分钟解决的一道数学题写几道数学题能帮忙看一下吗有一道英语题不会,请帮忙解决一下.请列举fell的有关短语速度解决一道数学题