Johnny Ball - Ball of Confusion

Think of your house number (as long as it's got two digits). Double it. Add 5. Multiply by 50. Add your age. Add the number of days in the year, 365. Subtract 615 and check the result. The first digits are your house number, the last two are your age. But why? There are 21 crows in a field. The farmer shoots 3. How many crows are left in the field? Ball of Confusion features puzzles and problems from Johnny Ball's slot on his daughter Zoe's BBC Radio 2 show as well as many more, designed for every level of difficulty -- from some solved in a twinkling of an eye to some that will seriously knit your brow. From how to cheat in a coin toss to why it is that some parts of a high speed train travelling at 125mph are actually going backwards, Ball of Confusion will twist your brain into enjoyable knots of empuzzlement for hours on end... Find our more about the book, published by Icon Books on 6th October 2011, here: http://www.iconbooks.co.uk/book/ball-...