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

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 developing witty and compelling conundrums.
This treasury of fascinating puzzles starts with a variety of arithmetical and algebraical difficulties, together with demanding situations regarding funds, time, pace, and distance. Geometrical difficulties persist with, besides 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. ideas for all 536 difficulties are integrated, and captivating drawings brighten up the e-book.

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Just half as far as it is from here to Pigtown,' said Pat. "After a rapid refreshment at Pig town we went on another five miles, and then I asked Pat how far it was to Ballyfoyne. I got exactly the same reply. It was clear he could only think in terms of Pigtown. " What is the distance from Boghooley to Ballyfoyne? 96. A WALKING PROBLEM A man taking a walk in the country on turning round saw a friend of his walking 400 yards behind in his direction. They each walked 200 yards in a direct line, with their faces towards each other, and you would suppose that they must have met.

He wrote down the letters of the alphabet in this order: ABCD X EFGHI = ACGEFHIBD 48 Arithmetic & Algebraic Problems Every letter, he said, stood for a different digit, I to 9 (0 excluded). The number represented by the first four digits, when multiplied by the number containing five digits, equals the number containing all the nine digits in the order shown. Can you substitute digits for letters so that it works? 154. THE SHOPKEEPER'S PUZZLE A shopkeeper, for private marking, selects a word of ten letters (all different) such as NIGHTMARES, where each letter stands for one of the figures I, 2, 3, 4, 5, 6, 7, 8, 9, 0, in their order.

Can the reader find a case where the square palindrome contains an even number of figures? = 113. FACTORIZING What are the factors (the numbers that will divide it without any remainder) of this number-l 0 0 0 0 0 0 0 0 0 0 0 I? This is easily done if you happen to know something about numbers of this peculiar form. In fact, it is just as easy for me to give two factors if you insert, say, one hundred and one noughts, instead of eleven, between the two ones. There is a curious, easy, and beautiful rule for these cases.

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