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Enigmas & puzzles

By Ian Stewart   March 2007

The fifth elephant “I could have sworn I ordered four elephants,” said Paula Bear, principal pachyderm procurer at Longlegs Safari Park.

The lorry driver waved a grubby pink form. “It says five ‘ere.”

“Can’t you take one back?”

“Sorry, luv—no returns accepted.”

“But there’s nowhere to put a fifth elephant! We built four pens, using 16 prefabricated steel fences. [See figure 1, below] And we haven’t got any spare fences!”

“Couldn’t ya just… move ’em arahnd a bit?”

“Perhaps,” said Paula. “But we could move at most two fences…

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