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 graders, and twice as many fourth graders as fifth graders. What is the average number of minutes run per day by these students?
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
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