Peter GrabarchukVezi magazinul Libris- 3 stele, bazat pe 1 voturi
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.
