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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, although it is commonly used to mean "perfect vision" in countries using the Imperial system. (The metric equivalent is 6/6.)
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Dec 14, 2019 · I am interested in knowing why '%20' is used as a space in URLs, particularly why %20 was used and why we even need it in the first place.
Learn the definition, pronunciation and usage of the number 20 in English. See examples, synonyms, translations and related words for twenty.
Learn the meaning, history, and usage of the word twenty, a number equal to two times 10. See examples, synonyms, phrases, and related words for twenty.
Learn about the properties, factors, and uses of the number 20 in different systems and languages. Find out why 20 is an abundant number, a base 20 system, and a polyhedron.
Learn how to find the factors of 20 using different methods, such as factorization, division and prime factorization. See the positive and negative pair factors of 20, and the common factors of 20 with other numbers.
