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Superman flew due east from the Shetland Islands (Latitude 60 degrees North, Longitude 1.2 degrees West) until he was back where he started. The next day he flew do east from a capital city. Although...
A genuine mathematical question: Find a number so that when its last digit is put in front, the number is exactly doubled. eg 1. 25 becomes 52 (slightly more than doubled) eg 2. 112 becomes 211 (which...
A perfectly horizontal metal handrail constructed across the USA between Baltimore, Maryland and San Francisco in California measures 2,580 miles long. The chief engineer on the project informs you...
Ben and Jack decided to play tennis against each other. They bet £1 on each game they played. Ben won three bets and Jack won £5. How many games did they play?...
It is straightforward to show, using the inverse-square law, that a uniform shell of matter produces no gravitational force in the space within it. However, the inverse-square law assumes Newtonian...