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How much is 25?

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 It's about three-tenths the number of Keys on a Piano. In other words, 25 is 0.280 times the count of Keys on a Piano, and the count of Keys on a Piano is 3.60 times that amount. (Moden layout; A0 to C7) It's about one-third the number of Submarines in the US Navy. In other words, the count of Submarines in the US Navy is 2.90 times 25. (a.k.a. Subs) (includes all types, all classes) (2015 figures) The United States Navy maintains a fleet of 72 active submarines. A typical submarine goes to sea with a crew of about 140. It's about half the number of Countries in Africa. In other words, 25 is 0.460 times the count of Countries in Africa, and the count of Countries in Africa is 2.20 times that amount. (2016 figures) (sovereign states recognized by the UN only) The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants. It's about half the number of Teeth in a Great White Shark's Mouth. In other words, 25 is 0.520 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 1.90 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 nine-tenths the number of Countries in the European Union. In other words, 25 is 0.890 times the count of Countries in the European Union, and the count of Countries in the European Union is 1.10 times that amount. (a.k.a. EU) (2016 figures) It's about one-and-seven-tenths times the number of Living Kings and Queens. In other words, the count of Living Kings and Queens is 0.590 times 25. (2015 figures) (distinct Monarchs) It's about three times the number of Symphonies Composed by Beethoven. In other words, 25 is 2.777777777780 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.360 times that amount. (a.k.a. Ludwig van Beethoven)