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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. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The seven selected problems span a number of mathematical fields, namely algebraic geometry, arithmetic geometry, geometric topology, mathematical physics, number theory, partial differential equations, and theoretical computer science. Unlike Hilbert's problems, the problems selected by the Clay Institute were already renowned among ...

  4. Relative purchasing power parity - Wikipedia

    en.wikipedia.org/wiki/Relative_Purchasing_Power...

    A simple numerical example: If prices in the United States rise by 3% and prices in the European Union rise by 1%, then the price of EUR quoted in USD should rise by approximately 2%, which is equivalent with a 2% depreciation of the USD or an increase in the purchasing power of the EUR relative to that of the USD. Note that the above ...

  5. List of mathematical examples - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_examples

    This page will attempt to list examples in mathematics. To qualify for inclusion, an article should be about a mathematical object with a fair amount of concreteness. Usually a definition of an abstract concept, a theorem, or a proof would not be an "example" as the term should be understood here (an elegant proof of an isolated but particularly striking fact, as opposed to a proof of a ...

  6. International dollar - Wikipedia

    en.wikipedia.org/wiki/International_dollar

    The international dollar (int'l dollar or intl dollar, symbols Int'l$., Intl$., Int$), also known as Geary–Khamis dollar (symbols G–K$ or GK$), is a hypothetical unit of currency that has the same purchasing power parity that the U.S. dollar had in the United States at a given point in time.

  7. Time value of money - Wikipedia

    en.wikipedia.org/wiki/Time_value_of_money

    Time value of money problems involve the net value of cash flows at different points in time. In a typical case, the variables might be: a balance (the real or nominal value of a debt or a financial asset in terms of monetary units), a periodic rate of interest, the number of periods, and a series of cash flows. (In the case of a debt, cas

  8. Extraneous and missing solutions - Wikipedia

    en.wikipedia.org/wiki/Extraneous_and_missing...

    This counterintuitive result occurs because in the case where =, multiplying both sides by multiplies both sides by zero, and so necessarily produces a true equation just as in the first example. In general, whenever we multiply both sides of an equation by an expression involving variables, we introduce extraneous solutions wherever that ...

  9. Template:To USD - Wikipedia

    en.wikipedia.org/wiki/Template:To_USD

    Template to convert other currencies into United States dollars, by year, based on information from the International Monetary Fund Template parameters [Edit template data] Parameter Description Type Status Amount 1 value in foreign currency to convert to USD Example 22816 Number required Country code 2 country ISO 3166-1 alpha-3 country code Example MEX Line required year year Year to convert ...