A rancher is constructing a fence by stringing wire between posts 20 feet apart. If the fence is 400 feet long, how many posts must the rancher use?_出国考试答疑器_GMAT_试题

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题目：

A rancher is constructing a fence by stringing wire between posts 20 feet apart. If the fence is 400 feet long, how many posts must the rancher use?

选项:

A、A. 18

B、B. 19

C、C. 20

D、D. 21

E、E. 22

答案:

D

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不太明白题目讲什么。选了C。求解~~

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