黄皮数学p248-Q100

evelyn205205 · 发表于 2011-6-23 15:10:34

Jolene began building a picket fence by planting stakes in a row. The stakes were evenly spaced. After planting the first 10 stakes, Jolene measured the length of the row and found that the row was 27 feet long. She continued the row by planting another 10 stakes, and then measured the length of the entire row. How many feet long was the row of stakes Jolene had planted?

A. 37

B. 54

C. 57

D. 60

E. 81

答案是C。帮我解释一下这道题好么？为什么不是B呢？
谢谢！

evelyn205205 · 发表于 2011-6-23 19:22:53

盼一盼高人

evelyn205205 · 发表于 2011-6-23 21:42:33

is there anyone who can help me？

votchen2008 · 发表于 2011-6-23 22:41:02

10个东西中间9个间距 20个东西中间19个间距

evelyn205205 · 发表于 2011-6-24 11:03:18

10个东西中间9个间距 20个东西中间19个间距

-- by 会员 votchen2008 (2011/6/23 22:41:02)

然后呢，这道题求的是什么？
谢谢，不过再帮我解释一下行么，我数学基础不好。

evelyn205205 · 发表于 2011-6-25 18:39:37

自己顶一下

myfield · 发表于 2011-6-25 21:39:41

题设中说明了，每个东西都是等距摆放，前10个共27，就是说9个线段一共是27，平均每个是3，那么20个就应该是19个线段，一共是57

evelyn205205 · 发表于 2011-6-25 23:16:02

谢谢！我懂了！

黄皮数学p248-Q100

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