By Henry E. Dudeney, Martin Gardner

For 2 many years, self-taught mathematician Henry E. Dudeney wrote a puzzle web page, "Perplexities," for *The Strand Magazine.* Martin Gardner, longtime editor of *Scientific American*'s mathematical video games column, hailed Dudeney as "England's maximum maker of puzzles," unsurpassed within the volume and caliber of his innovations. This compilation of Dudeney's long-inaccessible demanding situations attests to the puzzle-maker's present for growing witty and compelling conundrums.

This treasury of interesting puzzles starts off with a range of arithmetical and algebraical difficulties, together with demanding situations concerning cash, time, velocity, and distance. Geometrical difficulties keep on with, besides combinatorial and topological difficulties that characteristic magic squares and stars, course and community puzzles, and map coloring puzzles. the gathering concludes with a chain of online game, domino, fit, and unclassified puzzles. ideas for all 536 difficulties are incorporated, and captivating drawings brighten up the ebook.

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Wilkinson, country house into the neighboring town at the rate of five and, because he is a little tired, he makes the return journey at miles per hour. The double journey takes him exactly seven tell the distance from his house to the town? walks from his miles per hour, the rate of three hours. Can you 92. THE MEETING CARS The Crackhams made their first stop at Bugleminster, where they were to spend the night at a friend's house. This friend was to leave home at the same time and ride to London to put up at the Crackhams' house.

But it is possible to tell from the evidence the fewest possible steps in that staircase. Can you do it? 59. M. on the same day to walk from Boneyham to Appleminster. They met on the road at five minutes past four oclock, and each man reached his destination at exactly the same time. Can you say at what time they both arrived? 60. RIDING IN THE WIND A man on a bicycle rode a mile in three minutes with the wind at his back, but it took him four minutes to return against the wind. How long would it take him to ride a mile if there was no wind?

How would you have managed it? 82. THE ESCALATOR "I counted fifty steps that I made in going down the escalator," said Walker. " If the staircase were stopped, how many steps would be visible? It is assumed that each man travelled at a uniform rate, and the speed of the staircase was also constant. 83. THE FOUR CYCLISTS The four circles represent cinder paths. The four cyclists started at noon. Each person rode round a different circle, one at the rate of six miles an hour, another at the rate of nine miles an hour, another at the rate of twelve miles an hour, and the fourth at the rate of fifteen miles an hour.