Henry Ernest Dudeney/Puzzles and Curious Problems/241 - A Hurdles Puzzle

Puzzles and Curious Problems by Henry Ernest Dudeney: $241$

A Hurdles Puzzle

The answers given in the old books to some of the best-known puzzles are often clearly wrong.

Yet nobody ever seems to detect their faults.

Here is an example.

A farmer had a pen made of fifty hurdles, capable of holding a hundred sheep only.

Supposing he wanted to make it sufficiently large to hold double that number, how many additional hurdles must he have?

Perhaps our readers might be interested in making a list of old puzzles that are wrong.

Sources

• 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Geometrical Problems: Various Geometrical Puzzles: $241$. -- A Hurdles Puzzle
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Geometrical Problems: Triangle, Square & Other Polygon Puzzles: $278$. A Hurdles Puzzle