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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)
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)
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)
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)
Typically shared between multiple railroad companies and stations, there are about 135 "Union Stations" in the United States. Of these, the busiest station is Chicago Union Station, which handles 120,000 passengers each year.
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)