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  2. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    There seems to be a discrepancy, as there cannot be two answers ($29 and $30) to the math problem. On the one hand it is true that the $25 in the register, the $3 returned to the guests, and the $2 kept by the bellhop add up to $30, but on the other hand, the $27 paid by the guests and the $2 kept by the bellhop add up to only $29.

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    A trick to learn to add with nines is to add ten to the digit and to count back one. Since we are adding 1 to the tens digit and subtracting one from the units digit, the sum of the digits should remain the same. For example, 9 + 2 = 11 with 1 + 1 = 2.

  4. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computer programming languages.

  5. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    The change-making problem addresses the question of finding the minimum number of coins (of certain denominations) that add up to a given amount of money. It is a special case of the integer knapsack problem , and has applications wider than just currency.

  6. The EU and a South American trade bloc reach a giant trade ...

    www.aol.com/eu-south-american-trade-bloc...

    The European Union reached a blockbuster free trade agreement Friday with Brazil, Argentina and the three other South American nations in the Mercosur trade alliance, capping a quarter-century of ...

  7. What November’s full moon in Taurus means for you - AOL

    www.aol.com/news/november-full-moon-taurus-means...

    The planets are on our side, so move forward and don’t look back. How the full moon may impact your sign Aries. Now may be the time to focus on elevating your savings. Don’t be too proud to ...

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