how many left?

A boy has 45 watermelons in the desert. He needs to get them across to
the Oasis fair, 15 miles away. He can only carry 15 watermelons at a
time, and he eats one watermelon every mile he walks, including walking
back to where he started from. He can also leave watermelons at any
mile he has walked, but no fractions of a mile. How many watermelons
can he possibly take to the fair? How did you arrive at your
conclusion?

所有跟帖： 

• 回複：how many left? -Jinjing- ♀ (2 bytes) () 01/12/2010 postreply 19:36:51

• 回複：回複：how many left? -Commentate- ♂ (20 bytes) () 01/13/2010 postreply 11:55:09

• 回複：回複：回複：how many left? -jinjing- ♀ (160 bytes) () 01/13/2010 postreply 18:23:15

• 回複：how many left? -commentate- ♂ (2 bytes) () 01/12/2010 postreply 19:45:41

• 回複：回複：how many left? -Jinjing- ♀ (7 bytes) () 01/12/2010 postreply 20:06:28

• 回複：how many left? -fruitbasket- ♀ (35 bytes) () 01/13/2010 postreply 05:32:27

• 回複：回複：how many left? -康MM- ♀ (89 bytes) () 01/13/2010 postreply 08:19:10

• 回複：回複：回複：how many left? -fruitbasket- ♀ (27 bytes) () 01/13/2010 postreply 12:45:10

• write out how you get 8, and that would be a proof -康MM- ♀ (0 bytes) () 01/13/2010 postreply 17:02:17

• 回複：write out how you get 8, and that would be a proof -Jinjing- ♀ (303 bytes) () 01/13/2010 postreply 17:55:32

• 回複：回複：how many left? -Commentate- ♂ (49 bytes) () 01/13/2010 postreply 08:29:05