By Henry E. Dudeney, Martin Gardner

For 2 a long time, 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 fascinating puzzles starts off with a variety of arithmetical and algebraical difficulties, together with demanding situations related to cash, time, velocity, and distance. Geometrical difficulties stick to, in addition to combinatorial and topological difficulties that function magic squares and stars, direction and community puzzles, and map coloring puzzles. the gathering concludes with a sequence of online game, domino, fit, and unclassified puzzles. ideas for all 536 difficulties are incorporated, and fascinating drawings liven up the booklet.

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Extra resources for 536 Puzzles and Curious Problems

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When did they finish their ride? 84. THE DONKEY CART "Three men," said Crackham, "Atkins, Brown, and Cranby, had to go a journey of forty miles. Atkins could walk one mile an hour, Brown could walk two miles an hour, and Cranby could go in his donkey cart at eight miles an hour. Cranby drove Atkins a certain distance, and, dropping him to walk the remainder, drove back to meet Brown on the way and carried him to their destination, where they all arrived at the same time. "How long did the journey take?

But if the figure is to be moved from the end to the beginning, there is no possible solution for the divisor 2. But there is a solution for the divisor 3. Can you find it? 34 Arithmetic & Algebraic Problems 109. THE TWO FOURS I am perpetually receiving inquiries about the old "Four Fours" puzzle. I published it in IS99, but have since found that it first appeared in the first volume of Knowledge (lSSI). It has since been dealt with at some length by various writers. The point is to express all possible whole numbers with four fours (no more and no fewer), using the various arithmetical signs.

But it can be done in much fewer moves. Digital Puzzles 39 129. DIGITS AND SQUARES One of Rackbrane's little Christmas puzzles was this: (1) What is the smallest square number, and (2) what is the largest square number that contains all the ten digits (I to 9 and 0) once, and once only? 130. DIGITAL SQUARES It will be found a very good puzzle to try to discover a number which, together with its square, shall contain all the nine digits once, and once only, the zero disallowed. Thus, if the square of 378 happened to be 152,694, it would be a perfect solution.

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