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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.
From the Publisher
Puzzle Box Volumes 1, 2 and 3
The difficulty level of each puzzle is marked by stars, ranging from 2 to 5.
Devised by world-renowned mathematicians, puzzle creators, and devoted puzzle lovers. A unique puzzle project! 300 original exercises in each volume.
Publisher : Dover Publications; Illustrated edition (November 16, 2016)
Language : English
Paperback : 96 pages
ISBN-10 : 0486810046
ISBN-13 : 978-0486810041
Item Weight : 9.6 ounces
Dimensions : 8.2 x 0.2 x 10.9 inches
List Price: $12.99