9780486810041: Puzzle Box, Volume 1 (Dover Brain Games & Puzzles)
Softcover
ISBN 10: 0486810046 ISBN 13: 9780486810041
Publisher: Dover Publications, 2016

Synopsis

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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About the Author

Peter 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.

"About this title" may belong to another edition of this title.

Publisher
Dover Publications
Publication date
2016
Language
English
ISBN 10 
0486810046
ISBN 13 
9780486810041
Binding
Paperback
Number of pages
96
Editor
Grabarchuk Peter, Grabarchuk Serhiy
Rating
  • 4.60 out of 5 stars
    5 ratings by Goodreads