The
Miller's
Puzzle
Answer :
The way to arrange the sacks of flour is as
follows:—2, 78, 156, 39, 4.
Here each pair when multiplied by its single neighbour makes the number
in the middle, and only five of the sacks need be moved.
There are just three other ways in which they might have been arranged
(4, 39, 156, 78, 2; or 3, 58, 174, 29, 6; or 6, 29, 174, 58, 3), but
they all require the moving of seven sacks. 
