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Subj:.....Dunce Puzzle by Sam Loyd (S589) 
          From the book 
            "More Mathematical Puzzles of Sam Loyd" 
          Edited by Martin Gardner 
          From: Dover Publications in 1960

How can these three little boys arrange themselves so 
that the digits marked on their clothing will form a 
three digit number evenly divisible by seven?
 
 

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                 THE SOLUTION
 

The boy with the number 6 stood on his head so that
the three of them could form the number 931.

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