This book is a treat for anyone interested in math, words, analysis, and problem solving. Analysis is an art, and the author shows how numbers and words can present or hide the problem.
The author builds the book around a set of problems he collected or invented over 20 years to help him hire people to work in his business. The problems turn out to be arenas where common sense does battle with dumb rules ("you can't add apples and oranges") and the art of definition (a passenger, a trip, a ticket, a traveler, and an airplane seat are different entities).
This is also a funny book! The problems are interesting and concrete. The book is structured, too, so the reader easily gets a chance to hack away at the problem, and also see how other folks have done solving the problem over the last 20 years. (The explantions some folks give to explain their answers are sometimes screamingly funny, but always interesting.)
This book is a fun read. It would also make a great companion text in a high school or college math or analysis course.