By Henry Ernest, Dudeney

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 growing witty and compelling conundrums.

This treasury of exciting puzzles starts with a variety of arithmetical and algebraical difficulties, together with demanding situations related to funds, time, velocity, and distance. Geometrical difficulties keep on with, besides 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 online game, domino, fit, and unclassified puzzles. strategies for all 536 difficulties are integrated, and fascinating drawings brighten up the e-book.

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**Extra info for 536 Puzzles and Curious Problems**

**Example text**

36 Arithmetic & Algebraic Problems 117. ANOTHER 37 DIVISION Here is an interesting extension of the last puzzle. If the nine digits are written at haphazard in any order, for example, 4 1 2539768, what are the chances that the number that happens to be produced will be divisible by 37 without remainder? 118. A DIGITAL DIFFICULTY Arrange the ten digits, 1 2 3 4 5 678 9 0, in such order that they shall form a number that may be divided by every number from 2 to 18 without in any case a remainder.

132. JUGGLING WITH DIGITS Arrange the ten digits in three arithmetical sums, employing three of the four operations of addition, subtraction, multiplication, and division, and using no signs except the ordinary ones implying those operations. Here is an example to make it quite clear: 3 + 4 = 7; 9 - 8 = 1; 30 + 6 = 5. But this is not correct, because 2 is omitted, and 3 is repeated. 133. EQUAL FRACTIONS Can you construct three ordinary vulgar fractions (say, '12, Ih, or 114, or anything up to ¥l inclusive) all of the same value, using in every group all the 40 Arithmetic & Algebraic Problems nine digits once, and once only?

75. THE RUNNER'S REFRESHMENT A man runs n times round a circular track whose radius is t miles. He drinks s quarts of beer for every mile that he runs. Prove that he will only need one quart! 76. EXPLORING THE DESERT Nine travellers, each possessing a car, meet on the eastern edge of a desert. They wish to explore the interior, always going due west. Each car can travel forty miles on the contents of the engine tank, which holds a gallon of fuel, and each can carry nine extra gallon cans of fuel and no more.