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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.
| ISBN | 9780486810041 |
| Autor(a) | Grabarchuk, Peter |
| Editora | Dover Publications |
| Ano de edição | 2016 |
| Páginas | 96 |
| Acabamento | Brochura |
| Dimensões | 27,70 X 20,80 |
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