A century is 100 years.
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A century is one hundred years.
One half a century equals 50 years as a century equals 100 years.
A century is 100 years One year = 1/100 century or 0.01 century
20 years is less than a century. A century is 100 years. So 20 years is one fifth of or 20% of a century.
One century is equal to 100 years. Therefore, 3 quarters of a century is 75 years.