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How much is 15?

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It's about one-fifth the number of Keys on a Piano.
In other words, 15 is 0.170 times the count of Keys on a Piano, and the count of Keys on a Piano is 5.90 times that amount.
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about one-tenth the number of Wolves in Yellowstone National Park.
In other words, 15 is 0.1440 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 6.940 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about one-tenth the number of Elements on the Periodic Table.
In other words, 15 is 0.1270 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 7.870 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)
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)
It's about one-tenth the number of Union Stations in the United States.
In other words, 15 is 0.1110 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 9.01 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
It's about one-tenth the number of Moons in our Solar System.
In other words, 15 is 0.1030 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 9.710 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about one-tenth the number of John Wayne films.
In other words, 15 is 0.0843 times the count of John Wayne films, and the count of John Wayne films is 11.90 times that amount.
(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)