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  2. 72 (number) - Wikipedia

    en.wikipedia.org/wiki/72_(number)

    72 is the sum between 60 and 12, the former being the second unitary perfect number before 6 (and the latter the smallest of only two sublime numbers). More specifically, twelve is also the number of divisors of 60, as the smallest number with this many divisors. [19] 72 is the number of distinct {7/2} magic heptagrams, all with a magic ...

  3. Grading systems by country - Wikipedia

    en.wikipedia.org/wiki/Grading_systems_by_country

    61–72 Borderline Tier VI E 0–60 ... Total points earned = 163.48 out of possible 260. ... meaning if a student has a 4.5 that is the equivalent of an A− or ...

  4. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    The top grade, A, is given here for performance that exceeds the mean by more than 1.5 standard deviations, a B for performance between 0.5 and 1.5 standard deviations above the mean, and so on. [17] Regardless of the absolute performance of the students, the best score in the group receives a top grade and the worst score receives a failing grade.

  5. 60 (number) - Wikipedia

    en.wikipedia.org/wiki/60_(number)

    The first fullerene to be discovered was buckminsterfullerene C 60, an allotrope of carbon with 60 atoms in each molecule, arranged in a truncated icosahedron. This ball is known as a buckyball, and looks like a soccer ball. The atomic number of neodymium is 60, and cobalt-60 (60 Co) is a radioactive isotope of cobalt.

  6. Rule of 72: What it is and how to use it - AOL

    www.aol.com/finance/rule-72-184255797.html

    The interest rate shouldn’t be expressed as a decimal out of 1, such as 0.07 for 7 percent. It should just be the number 7. So, for example, 72/7 is 10.3, or 10.3 years.

  7. Composite number - Wikipedia

    en.wikipedia.org/wiki/Composite_number

    For example, 72 = 2 3 × 3 2, all the prime factors are repeated, so 72 is a powerful number. 42 = 2 × 3 × 7, none of the prime factors are repeated, so 42 is squarefree. Euler diagram of numbers under 100:

  8. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    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.

  9. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    A decrease of 60% means the final amount is 40% of the original (100% – 60% = 40%). A decrease of 100% means the final amount is zero (100% – 100% = 0%). In general, a change of x percent in a quantity results in a final amount that is 100 + x percent of the original amount (equivalently, (1 + 0.01 x ) times the original amount).