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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?...
There are three people (Alex, Ben and Cody), one of whom is a knight, one a knave, and one a spy. The knight always tells the truth, the knave always lies, and the spy can either lie or tell the...
If we drop a lamp into a black hole, the lamp might reach the event horizon without being crushed. We would see the lamp becoming redder, but if we could observe longer and longer radio waves, it...
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...
Imagine it's the final jury vote at the Eurovision song contest with the UK two points ahead of Sweden. The points from the last country to vote which is neither the UK or Sweden are still in the...