536 Puzzles and Curious Problems by Henry E. Dudeney, Martin Gardner PDF

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 reward for developing witty and compelling conundrums.
This treasury of exciting puzzles starts off with a range of arithmetical and algebraical difficulties, together with demanding situations related to cash, time, velocity, and distance. Geometrical difficulties keep on with, in addition to combinatorial and topological difficulties that characteristic magic squares and stars, direction and community puzzles, and map coloring puzzles. the gathering concludes with a chain of video game, domino, fit, and unclassified puzzles. options for all 536 difficulties are incorporated, and captivating drawings liven up the booklet.

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QUEER DIVISION The following is a rather curious puzzle. Find the smallest number that, when divided successively by 45, 454, 4545 and 45454, leaves the remainders 4, 45, 454, and 4,545 respectively. This is perhaps not easy but it affords a good arithmetical exercise. 122. THREE DIFFERENT DIGITS The professor, a few mornings ago, proposed that they should find all those numbers composed of three different digits such that each is divisible without remainder by the square of the sum of those digits.

Of course, each went at his proper speed throughout and there was no waiting. I might have complicated the problem by giving more passengers, but I have purposely made it easy, and all the distances are an exact number of miles-without fractions. 66. THE DISPATCH RIDER If an army forty miles long advances forty miles while a dispatch rider gallops from the rear to the front, delivers a dispatch to the commanding general, and returns to the rear, how far has he to travel? 67. THE TWO TRAINS Two railway trains, one four hundred feet long and the other two hundred feet long, ran on parallel rails.

Take this as Cryptarithm Puzzles 49 an example. " WRONG WRONG RIGHT "If you substitute correct figures the little addition sum will work correctly. " 157. LETTER MULTIPLICATION In this little multiplication sum the five letters represent five different digits. What are the actual figures? There is no O. SEAM T MEATS 158. THE CONSPIRATORS' CODE A correspondent (G. ) sends this interesting puzzle. Two conspirators had a secret code. Their letters sometimes contained little arithmetical sums relating to some quite plausible discussion, and having an entirely innocent appearance.

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536 Puzzles and Curious Problems by Henry E. Dudeney, Martin Gardner

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