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    Puzzle Box, Volume 1

    # 23207
    $20.25
    Product Specifications
    • Brand: Dover Publications.
    • Item Number: 23207.
    • Manufacturer Number: 9780486810041.
    • UPC: 8-00759-81004-8.
    • EAN: 0486810046.
    • ISBN: 9780486810041.
    • Width: 8.25 inches.
    • Height: 11.00 inches.
    • Weighs approximately: 0.70 pounds.
    Availability
    • In Stock* at
    • The Forks Store: In Stock
      details
    Multiplying 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?
    On my broken calculator with keys + - ÷ x =, the only functional number is 7. How can I get 34 to appear in the readout?
    A 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?
    These 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.
    Seventeen 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.
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