Henry Ernest Dudeney/Puzzles and Curious Problems/212 - Transplanting the Trees

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Puzzles and Curious Problems by Henry Ernest Dudeney: $212$

Transplanting the Trees
A man has a plantation of $22$ trees arranged in the manner shown.
Dudeney-Puzzles-and-Curious-Problems-212.png
How is he to transplant only six of the trees so that they shall then form $20$ rows with $4$ trees in every row?.


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Sources