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 fascinating puzzles starts with a range of arithmetical and algebraical difficulties, together with demanding situations regarding cash, time, pace, and distance. Geometrical difficulties keep on with, in addition to combinatorial and topological difficulties that function 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. recommendations for all 536 difficulties are incorporated, and fascinating drawings liven up the booklet.
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Additional info for 536 Puzzles and Curious Problems
THE TWO TRAINS Two railway trains, one four hundred feet long and the other two hundred feet long, ran on parallel rails. It was found that when they went in opposite directions they passed each other in five seconds, but when they ran in the same direction the faster train would pass the other in fifteen seconds. A curious 20 Arithmetic & Algebraic Problems passenger worked out from these facts the rate per hour at which each train ran. Can the reader discover the correct answer? Of course, each train ran with a uniform velocity.
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. But in their code each of the ten digits represented a different letter of the alphabet. Thus, on one occasion, there was a little sum in simple addition which, when the letters were substituted for the figures, read as follows: FL Y FOR YOUR L I FE It will be found an interesting puzzle to reconstruct the addition sum with the help of the due that I and 0 stand for the figures I and 0 respectively.
But Brown, with a contempt for his opponent, took things too easily at the beginning, and when he had run one-sixth of his distance he met Tompkins, and saw that his chance of winning the race was very small. How much faster than he went before must Brown now run in order to tie with his competitor? The puzzle is quite easy when once you have grasped its simple conditions. 71. THE TWO SHIPS A correspondent asks the following question. Two ships sail from one port to another-two hundred nautical miles-and return.