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The misdirection in this riddle is in the second half of the description, where unrelated amounts are added together and the person to whom the riddle is posed assumes those amounts should add up to 30, and is then surprised when they do not — there is, in fact, no reason why the (10 − 1) × 3 + 2 = 29 sum should add up to 30.
The Ages of Three Children puzzle (sometimes referred to as the Census-Taker Problem [1]) is a logical puzzle in number theory which on first inspection seems to have insufficient information to solve. However, with closer examination and persistence by the solver, the question reveals its hidden mathematical clues, especially when the solver ...
The equality of the two geometric sequences can be stated as the equation (2 0 + 2 1 + 2 2)(7 0 + 7 1 + 7 2 + 7 3 + 7 4) = 7 1 + 7 2 + 7 3 + 7 4 + 7 5, which relies on the coincidence 2 0 + 2 1 + 2 2 = 7. Note that the author of the papyrus listed a wrong value for the fourth power of 7; it should be 2,401, not 2,301.
Q: What do the numbers 11, 69 and 88 all have in common? A: They all read the same way when placed upside down. Q: If 2 is company and 3 is a crowd, what are 4 and 5? A: 9. Q: I add 5 to 9 and get 2.
The Zebra Puzzle is a well-known logic puzzle.Many versions of the puzzle exist, including a version published in Life International magazine on December 17, 1962. The March 25, 1963, issue of Life contained the solution and the names of several hundred successful solvers from around the world.
Famous Trick Donkeys is a puzzle invented by Sam Loyd in 1858, [1] first printed on a card supposed to promote P.T. Barnum's circus. At that time, the puzzle was first called "P.T. Barnum's trick mules". [2] Millions of cards were sold, with an estimated income for Sam Loyd of $10,000 from 1871 [3] —more than $200,000 in 2023 dollars. [4]
The Hardest Logic Puzzle Ever is a logic puzzle so called by American philosopher and logician George Boolos and published in The Harvard Review of Philosophy in 1996. [1] [2] Boolos' article includes multiple ways of solving the problem.
Same rules as Series 1, but with some changes: Questions in Round 1 are worth £25 and riddles are worth £100. Questions in Round 2 are worth £50, riddles are worth £200 and thrown-over riddles are worth £100. Questions in Round 3 are worth £100, riddles are worth £300 and thrown-over riddles are worth £150.