(related to Problem: Plates And Coins)
Number the plates from $1$ to $12$ in the order that the boy is seen to be going in the illustration. Starting from $1,$ proceed as follows, where "$1$ to $4$" means that you take the coin from plate No. $1$ and transfer it to plate No. $4$: $1$ to $4,$ $5$ to $8,$ $9$ to $12,$ $3$ to $6,$ $7$ to $10,$ $11$ to $2,$ and complete the last revolution to $1,$ making three revolutions in all. Or you can proceed this way: $4$ to $7,$ $8$ to $11,$ $12$ to $3,$ $2$ to $5,$ $6$ to $9,$ $10$ to $1.$ It is easy to solve in four revolutions, but the solutions in three are more difficult to discover.
This is "The Riddle of the Fishpond" (No. $41,$ Canterbury Puzzles) in a different dress.
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