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How much is 15?

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It's about the number of Living Kings and Queens
(2015 figures) (distinct Monarchs)
It's about one-and-two-thirds times the number of Symphonies Composed by Beethoven
In other words, 15 is 1.666666666670 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.5999999999990 times that amount.
(a.k.a. Ludwig van Beethoven)
It's about three-fifths the number of Countries in the European Union
In other words, 15 is 0.560 times the count of Countries in the European Union, and the count of Countries in the European Union is 1.80 times that amount.
(a.k.a. EU) (2016 figures)
There are 27 member countries in the European Union, the latest member of which is Croatia. The EU is largely urban, with over twenty cities having a population of one million or more, and 75% of the population living in an urban area.
It's about three-tenths the number of Teeth in a Great White Shark's Mouth
In other words, 15 is 0.310 times the count of Teeth in a Great White Shark's Mouth, and the count of Teeth in a Great White Shark's Mouth is 3.20 times that amount.
(Carcharodon carcharias) (average; including developing rows)
It's about one-fourth the number of Countries in Africa
In other words, 15 is 0.270 times the count of Countries in Africa, and the count of Countries in Africa is 3.70 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about four times the number of Living U.S. Presidents
In other words, the count of Living U.S. Presidents is 0.30 times 15.
(a.k.a. Presidents of the United States; a.k.a. Presidents of the United States of America; a.k.a. POTUS), (2016 figures) (including current)
It's about one-fifth the number of Submarines in the US Navy
In other words, 15 is 0.210 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 4.80 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)