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That is by definition of the word "century". Humans like to count in powers of 10 (100, 100, 1000, etc.), since it is easiest to work with (with the numbering system we use), so humans invented a special name for "10 years", and another for "1000 years", and yet another for "100 years".
A 100 years is a century
Century = 100 years; decade = 10 years.Century = 100 years; decade = 10 years.Century = 100 years; decade = 10 years.Century = 100 years; decade = 10 years.
100 years is a century
There were 100 years in the 20th century.