100 Numerical Games
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About this ebook
Timothy's house has several rooms, each of which has an even number of doors, including doors that lead outside. Is the number of outside doors even or odd?
Stimulating and delightful, this collection of puzzles features original and classic brainteasers. The author, a puzzle columnist for Le Monde, specially selected these mind-benders for the widest possible audience, ensuring that they're neither too hard for those without a math background nor too easy for the mathematically adept. All puzzles are clearly stated and accurately answered at the back of the book ― and they're great fun to consider, whether you crack them or not. Includes a Foreword by Martin Gardner.
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Book preview
100 Numerical Games - Pierre Berloquin
100
Numerical
GAMES
Pierre Berloquin
Foreword by
Martin Gardner
Illustrated by
Denis Dugas
Dover Publications, Inc.
Mineola, New York
Copyright
Copyright © 1976 by Pierre Berloquin
All rights reserved.
Bibliographical Note
This Dover edition, first published in 2015, is an unabridged republication of the work originally published in 1976 by Charles Scribner’s Sons, New York.
International Standard Book Number
eISBN-13: 978-0-486-80569-6
Manufactured in the United States by Courier Corporation
78958601 2015
www.doverpublications.com
Contents
Foreword
Problems
Solutions
Foreword
Pierre Berloquin, who put together this stimulating and delightful collection of mind benders, is a clever young Frenchman who was born in 1939 in Tours and graduated in 1962 from the École Nationale Supérieure des Mines in Paris. His training as an operations research engineer gave him an excellent background in mathematics and logical thinking.
But Berloquin was more interested in writing than in working on operations research problems. After two years with a Paris advertising agency, he decided to try his luck at freelance writing and this is how he has earned his living since. In 1964 he began his popular column on Games and Paradoxes
in the magazine Science et Vie (Science and Life). Another column, From a Logical Point of View,
appears twice monthly in The World of Science, a supplement of the Paris newspaper Le Monde. Occasionally he contributes to other French magazines. One of his favorite avocations is leading groups of créativité
a French cocktail of brainstorming, synectics, and encounter therapy, for the discovery of new ideas and the solution of problems—a logical extension of his interest in puzzles.
Berloquin’s published books are Le Livre des Jeux (card and board games), Le Jeu de Tarot (tarot card game), Testez Votre Intelligence (intelligence tests), 100 Grandes Réussites (solitaire games), Un Souvenir d’Enfance d’Evariste Galois (Memoir of the Childhood of Evariste Galois) and 100 Jeux de Cartes Classiques (card games); he is coauthor of Voulez-Vous Jouer avec Nous (Come Play with Us) and Le Livre des Divertissements (party games).
This volume is Berloquin’s own translation into English of one of his four paperback collections of brainteasers which have been enormously popular in France and Italy since they were published in Paris in 1973. This one is concerned only with numerical puzzles. The other three contain geometric, logical, and alphabetical problems. Denis Dugas, the graphic artist who illustrated all four books, is one of the author’s old friends.
The puzzles in this collection have been carefully selected or designed (many are original with the author or artist) so that none will be too difficult for the average reader who is not a mathematician to solve, and at the same time not be too easy. They are all crisply, clearly given, accurately answered at the back of the book, and great fun to work on whether you crack them or not.
At present, Berloquin is living in Neuilly, a Paris suburb, with his wife, Annie, and their two children.
Martin Gardner
PROBLEMS
Game 1
Timothy spent all his money in five stores. In each store, he spent $ 1 more than half of what he had when he came in.
How much did Timothy have when he entered the first store?
Game 2
How many ways can you read ACE off the diagram? You can move horizontally, vertically, or diagonally.
Game 3
Let us follow the hour hand and minute hand of a clock for 24 hours.
How many times do they form a right angle?
Game 4
Add arithmetical symbols between the 2’s to make every equation true. You may use plus, minus, times, and divide symbols, as well as parentheses and brackets for grouping.