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  2. Balance puzzle - Wikipedia

    en.wikipedia.org/wiki/Balance_puzzle

    b. The odd coin is among the population of 8 coins, proceed in the same way as in the 12 coins problem. 3) Test 2a, Test 3 of the coins from the group of 5 coins against any 3 coins from the population of 8 coins: a. If the 3 coins balance, then the odd coin is among the remaining population of 2 coins.

  3. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The Clay Institute has pledged a US $1 million prize for the first correct solution to each problem. The Clay Mathematics Institute officially designated the title Millennium Problem for the seven unsolved mathematical problems, the Birch and Swinnerton-Dyer conjecture, Hodge conjecture, Navier–Stokes existence and smoothness, P versus NP ...

  4. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  5. Mathematical problem - Wikipedia

    en.wikipedia.org/wiki/Mathematical_problem

    A mathematical problem is a problem that can be represented, analyzed, and possibly solved, with the methods of mathematics. This can be a real-world problem, such as computing the orbits of the planets in the solar system, or a problem of a more abstract nature, such as Hilbert's problems .

  6. Weighing matrix - Wikipedia

    en.wikipedia.org/wiki/Weighing_matrix

    Weighing matrices take their name from the problem of measuring the weight of multiple objects. If a measuring device has a statistical variance of σ 2 {\displaystyle \sigma ^{2}} , then measuring the weights of N {\displaystyle N} objects and subtracting the (equally imprecise) tare weight will result in a final measurement with a variance of ...

  7. Goat grazing problem - Wikipedia

    en.wikipedia.org/wiki/Goat_grazing_problem

    The goat problems do not yield any new mathematical insights; rather they are primarily exercises in how to artfully deconstruct problems in order to facilitate solution. Three-dimensional analogues and planar boundary/area problems on other shapes, including the obvious rectangular barn and/or field, have been proposed and solved. [ 1 ]

  8. Giant pumpkin - Wikipedia

    en.wikipedia.org/wiki/Giant_pumpkin

    The Smithsonian notes that "improbably", giant pumpkins trace themselves to Henry David Thoreau, who in 1857 grew a pumpkin weighing 123 lb (56 kg), which he detailed in his unfinished work Wild Fruits. [2] The first competition giant pumpkins were grown by William Warnock of Ontario, Canada. His first record was 365 lb (166 kg), measured at ...

  9. Quarter (United States coin) - Wikipedia

    en.wikipedia.org/wiki/Quarter_(United_States_coin)

    Its current version is composed of two layers of cupronickel (75% copper, 25% nickel) clad on a core of pure copper. [2] With the cupronickel layers comprising 1/3 of total weight, the coin's overall composition is therefore 8.33% nickel, 91.67% copper. Its weight is 0.1823 troy oz. or 0.2000 avoirdupois oz. (5.670 grams).