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How much is 15?

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It's about eight times the number of Escalators in the State of Wyoming.
In other words, the count of Escalators in the State of Wyoming is 0.10 times 15.
(2013 figures)
There are only two escalators in the State of Wyoming (although there are apparently plenty of elevators). It is speculated that the lack of escalators is due to the older age of the buildings and the abundance of cheap land resulting in single-story structures. At the time the last count of escalators was made, the state had a population of just 576,000 people.
It's about three 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)
As of this writing, there are five living United States Presidents — President Carter, President Clinton, President Obama, and the two Presidents Bush. At no point in U.S. history have their been more than six (6) living presidents, this circumstance having occurred three times.
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 the number of Living Kings and Queens.
It's about half the number of Countries in the European Union.
In other words, 15 is 0.540 times the count of Countries in the European Union, and the count of Countries in the European Union is 1.90 times that amount.
(a.k.a. EU) (2016 figures)
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)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about three-tenths the number of Countries in Africa.
In other words, 15 is 0.280 times the count of Countries in Africa, and the count of Countries in Africa is 3.60 times that amount.
(2016 figures) (sovereign states recognized by the UN only)