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How much is 45?

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 It's about nine-tenths the number of Teeth in a Great White Shark's Mouth In other words, 45 is 0.94 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 1.1 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 four-fifths the number of Countries in Africa In other words, 45 is 0.8 times the count of Countries in Africa, and the count of Countries in Africa is 1.3 times that amount. (2016 figures) (sovereign states recognized by the UN only)The continent of Africa includes 56 sovereign countries recognized by the United Nations as of 2020. It is the second-most populous continent in the world, with 1.3 billion inhabitants.List_of_sovereign_states_and_dependent_territories_in_Africa It's about three-fifths the number of Submarines in the US Navy In other words, 45 is 0.63 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 1.6 times that amount. (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 one-and-seven-tenths times the number of Countries in the European Union In other words, 45 is 1.7 times the count of Countries in the European Union, and the count of Countries in the European Union is 0.59 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 half the number of Keys on a Piano In other words, 45 is 0.51 times the count of Keys on a Piano, and the count of Keys on a Piano is 2 times that amount. (Moden layout; A0 to C7) It's about two-fifths the number of Wolves in Yellowstone National Park In other words, 45 is 0.433 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 2.31 times that amount. (a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area) It's about two-fifths the number of Elements on the Periodic Table In other words, 45 is 0.381 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 2.62 times that amount. (a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)