Ball of Confusion: Puzzles, Problems and Perplexing Posers by Johnny Ball (Paperback, 2012)

Brand new: lowest price

£3.60

Free postage
  • Get it by Wed, 19 Dec - Thu, 20 Dec from GB, United Kingdom
  •  • New condition
  •  • 30 day returns - Buyer pays return postage | Returns policy
Think of your house number (as long as it`s got two digits). Double it. Multiply by 50. Add your age. Subtract 615 and check the result. The first digits are your house number the last two are your age.
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