A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could not be the length of the fence in feet? (12 inches = 1 foot)
A. 17
B. 28
C. 35
D. 39
E. 50
Kevin Butler has been covering education for more than five years at the Press-Telegram. Previously he was a reporter at the Los Angeles Independent weeklies and in the Washington, D.C., bureau of Investor's Business Daily. A native of Houston, Butler graduated from the University of Texas at Austin with a bachelor's in economics and government. 

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