Dover Math Games and Puzzles Ser.: Challenging Math Problems by Terry Stickels (2015, Trade Paperback)

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How can you accomplish this without bending, folding, or cutting the stringsA positive whole number is divisible by 3 and also by 5. When the number is divided by 7, the remainder is 5. What is the smallest number that could workThese are but a few of this book's assembly of the most challenging puzzles imaginable and they require no background in higher math, just good thinking skills.