The book of the deceased Ya. I. Perelman belongs to the number of the most accessible books from the author's well-known cycle devoted to the interesting questions of mathematics. Here are collected various mathematical problems, from which many are turned into the form of small stories. For their solution, it is enough to be acquainted with elementary arithmetics and the easiest informations of geometry.
The book is intended for teenagers-students of middle school, trade and railway schools, schools of working youth and for adults who are seeking a reasonable and useful entertainment in the hours of rest.
(Source: annotation in book, translated from Russian)