{"product_id":"9780486805696","title":"100 Numerical Games","description":"\u003ci\u003eFollow the hour hand and minute hand of a clock for 24 hours. How many times do they form a right angle?\u003cbr\u003eTimothy'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?\u003cbr\u003e\u003c\/i\u003eStimulating and delightful, this collection of puzzles features original and classic brainteasers. The author, a puzzle columnist for \u003ci\u003eLe Monde,\u003c\/i\u003e 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.","brand":"Dover Publications","offers":[{"title":"Default Title","offer_id":47126394241264,"sku":"9780486805696","price":8.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9780486805696_p0.jpg?v=1763709341","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9780486805696","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}