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How much is 30?

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It's about one-and-one-tenth times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.91 times 30.
(a.k.a. EU) (2016 figures)
It's about three-fifths the number of Teeth in a Great White Shark's Mouth.
In other words, 30 is 0.63 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 1.6 times that amount.
(Carcharodon carcharias) (average; including developing rows)
It's about three-fifths the number of Countries in Africa.
In other words, 30 is 0.56 times the count of Countries in Africa, and the count of Countries in Africa is 1.8 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about two times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.5 times 30.
(2015 figures) (distinct Monarchs)
It's about two-fifths the number of Submarines in the US Navy.
In other words, 30 is 0.42 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 2.4 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about one-third the number of Keys on a Piano.
In other words, the count of Keys on a Piano is 2.9 times 30.
(Moden layout; A0 to C7)
It's about three-and-a-half times the number of Symohonies Composed by Beethoven.
In other words, 30 is 3.33333333333 times the count of Symohonies Composed by Beethoven, and the count of Symohonies Composed by Beethoven is 0.3 times that amount.
(a.k.a. Ludwig van Beethoven)