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2. Coin problem - Wikipedia

   en.wikipedia.org/wiki/Coin_problem

   Frobenius coin problem with 2-pence and 5-pence coins visualised as graphs: Sloping lines denote graphs of 2x+5y=n where n is the total in pence, and x and y are the non-negative number of 2p and 5p coins, respectively. A point on a line gives a combination of 2p and 5p for its given total (green).

3. Balance puzzle - Wikipedia

   en.wikipedia.org/wiki/Balance_puzzle

   For example, in detecting a dissimilar coin in three weighings (⁠ = ⁠), the maximum number of coins that can be analyzed is ⁠ = ⁠.Note that with ⁠ ⁠ weighings and ⁠ ⁠ coins, it is not always possible to determine the nature of the last coin (whether it is heavier or lighter than the rest), but only that the other coins are all the same, implying that the last coin is the ...

4. Coin rotation paradox - Wikipedia

   en.wikipedia.org/wiki/Coin_rotation_paradox

   The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

5. Verbal arithmetic - Wikipedia

   en.wikipedia.org/wiki/Verbal_arithmetic

   The goal is to identify the value of each letter. The name can be extended to puzzles that use non-alphabetic symbols instead of letters. The equation is typically a basic operation of arithmetic, such as addition, multiplication, or division. The classic example, published in the July 1924 issue of Strand Magazine by Henry Dudeney, [1] is:

6. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   The carry step of the multiplication can be performed at the final stage of the calculation (in bold), returning the final product of 45 × 256 = 11520. This is a variant of Lattice multiplication. The modern method of multiplication based on the Hindu–Arabic numeral system was first described by Brahmagupta. Brahmagupta gave rules for ...

7. China's Huawei Technologies seeks dismissal of US criminal ...

   www.aol.com/news/chinas-huawei-technologies...

   Huawei Technologies asked a U.S. judge to dismiss much of a federal indictment accusing the Chinese telecommunications company of trying to steal technology secrets from U.S. rivals and misleading ...