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In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet (6.1 m), although it is commonly used to mean "perfect vision" in countries using the Imperial system.
Узнайте сколько стоит 20 долларов США (USD) в рублях (RUB) сегодня. Динамика стоимости доллара США в российских рублях, конвертер валют – Рамблер/личные финансы
The ancient Mayan numerical system – counting on fingers and toes – was a base 20 or "vigesimal" system. A polyhedron of 20 faces is an icosahedron, one of the five Platonic solids.
20 Look up twenty in Wiktionary, the free dictionary. Twenty or 20 may refer to: 20 (number), the natural number following 19 and preceding 21 one of the years 20 BC, AD 20, 1920, 2020
The number 20 in math represents a whole number that comes after 19 and before 21. It is an even integer and can be written in different forms such as a numeral (20), word form (twenty), or expanded form (2 × 10).







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