作业帮A forest ranger captures and tags 80 deer.a month later she captures 50 deer and finds that seven have tags.Approximately how many deer are in the area?
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A forest ranger captures and tags 80 deer.a month later she captures 50 deer and finds that seven have tags.Approximately how many deer are in the area?
A forest ranger captures and tags 80 deer.a month later she captures 50 deer and finds that seven have tags.Approximately how many deer are in the area?
A forest ranger captures and tags 80 deer.a month later she captures 50 deer and finds that seven have tags.Approximately how many deer are in the area?
deer单复数同型
一个护林员捕获80只鹿并贴标签.（放回林子）一个月后,她捕获50只鹿,发现其中7只带有标签,问林中大约有大少只鹿?
80÷（7/50）=571
so,there are approximately 571 deer in the area.
80/(7/50)=4000/7
大约有571只鹿
抓住80只，并给它们绑上标签。
一个月后抓了50只，其中有7只有标签。假定都是随机的，则7/50 = 14%的鹿被绑上标签。 此地区大约有80/14% ≈ 570只
森林游侠捕获和标签 80 鹿。一个月以后，她可以捕获 50 鹿，发现七有标签。区域中的大约多少鹿？
123 deers
要注意deer+s！