A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 9 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)	Pick one
A) 29  B) 48  C) 55  D) 67  E) 86
There is one post for each length of chain, plus one final post at the end.   The length of the fence in feet is 9.5x + 0.5, where each is the number of chain lengths.   The length of the fence is an integer when x = 1,3,5,7,...   The length of the fence could be 10, 29, 48, 67, 86,...   The answer is 55.
<result>C</result>
A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 9 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)