{"product_id":"puzzle-box-volume-1-paperback","title":"Puzzle Box, Volume 1 - Paperback","description":"\u003cp\u003eby \u003cb\u003ePeter Grabarchuk\u003c\/b\u003e (Editor), \u003cb\u003eSerhiy Grabarchuk\u003c\/b\u003e (Editor), \u003cb\u003ePeter Winkler\u003c\/b\u003e (Foreword by)\u003c\/p\u003e\u003cp\u003e\u003ci\u003eMultiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I?\u003cbr\u003eOn my broken calculator with keys ] -   x =, the only functional number is 7. How can I get 34 to appear in the readout?\u003cbr\u003eA country mints four denominations of coins, in whole numbers of cents. It takes four of these coins to make 21 , or 24 , or 25 , or 26 . What are the denominations of the coins?\u003cbr\u003e\u003c\/i\u003eThese and almost 300 other mathematical puzzles appear in this original collection, devised by world-renowned mathematicians, puzzle creators, and devoted puzzle lovers. A unique puzzle project, it unites the efforts of a dozen authors, including software engineer Andrea Gilbert and Bram Cohen, author of the P2P BitTorrent protocol. \u003cbr\u003eSeventeen different types of challenges include 3-D puzzles, chess puzzles, connections, dissections, foldings, geometrical puzzles, logic problems, matchstick puzzles, mazes, moving pieces, number puzzles, put-togethers, strimko, sudoku, visual puzzles, weightings, and word puzzles. The difficulty level of each puzzle is marked by stars, ranging from 2 to 5. Average difficulty level is about 3 stars, promising puzzle enthusiasts many entrancing hours of solving and enjoyment.\u003c\/p\u003e\u003ch3\u003eAuthor Biography\u003c\/h3\u003e\u003cp\u003ePeter and Serhiy Grabarchuk are part of the Grabarchuk Puzzle Family. Over a period of decades they have produced puzzle books, puzzle apps, interactive puzzles, and more.\u003c\/p\u003e\u003cdiv\u003e\n\u003cstrong\u003eNumber of Pages:\u003c\/strong\u003e 96\u003c\/div\u003e\u003cdiv\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.2 x 10.9 x 8.2 IN\u003c\/div\u003e\u003cdiv\u003e\n\u003cstrong\u003eIllustrated:\u003c\/strong\u003e Yes\u003c\/div\u003e\u003cdiv\u003e\n\u003cstrong\u003ePublication Date:\u003c\/strong\u003e November 16, 2016\u003c\/div\u003e","brand":"Books by splitShops","offers":[{"title":"Default Title","offer_id":51756302008608,"sku":"9780486810041","price":19.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/9764\/5344\/files\/9a54a2c89d99a61a3089786345c5674c.webp?v=1780078381","url":"https:\/\/ebocreations.com\/products\/puzzle-box-volume-1-paperback","provider":"The E-Book Oasis LLC","version":"1.0","type":"link"}