Brain Teasers 15-4

Students would delight in calling the first 3 problems ‘trick problems’, but they’re not.  They just need some careful thinking and/or careful reading.  So HAVE FUN . . . but don’t be too hasty :-).
1.  Several years ago, I drove a nail into a tree exactly five feet above the ground.  The tree grows at a rate of one half-foot per year.  Last year, 11 years later, I returned and saw the tree. How far above the ground was the nail?
2.  The volumes of Gibbon’s Decline and Fall of the Roman Empire stand side by side on a bookshelf (Vol I to the left of Vol II, etc).  A bookworm starts at page 1 of Volume I and bores his way in a straight line to the last page of Volume II.  If each cover is 1/8 inch thick, and each book with the covers is 2 inches thick, how far did the book worm travel?
3.  A bear left its den and walked straight south for 1 mile.  Then it turned left (right angle) and walked another mile.  Finally it turned left again, and walked one more mile – arriving right back at its den!  What color was the bear – and why?


 Submit Answers!  There are NO tests and the answers are NOT graded, so lighten up!  🙂  If you want to submit  your answers to any or all of these, PLEASE feel free to do so!!  
You can always do this 3 ways:  1)  Use the Leave A Reply section below (though I may not make it public until after the deadline);   2) reply to (or contact) me directly by e-mail or by replying to any Weekly Sharing; or 3) by using the Contact Form link.   Your anonymity is protected for all formats (but only until submission deadline for the Leave a Reply format. )
Reminder:  Deadline for submissions (at least for recognition next week) is noon on Thursday 2/26.  

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