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Название: Good Old Fashioned Challenging Puzzles and Perplexing Mathematical Problems (Puzzle Books)
Автор: Dudeney H.
Contains mathematical brain teasers, first published in 1917, as the puzzles regularly appeared in newspapers and magazines. This book includes new twists on old puzzles, as well as other puzzles - some reasonably easy and others very hard
Read more at http://ebookee.org/Good-Old-Fashioned-Challenging-Puzzles-and-Perplexing-Mathematical-Problems_201089.html#fKjflYdbwJdBReuS.99