1/100
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A fraction requires two numbers. 21 days as a fraction of what? A month, a year, a century?
1 century = 100 years → you know that 1 year = 52 weeks 1 century = 100 * 52 weeks 1 century = 5200 weeks 1 century = 5200 weeks x century = 13 weeks You make the cross-multiply, and you get: 5200x = 13 x = 13/5200 → you simplify by 13 x = 1/400 13 weeks represent a fraction of 1/400 of century.
It is: 40/100 = 2/5 of a century
4/5 of a century is 80 years.
It is 1/10 because a decade is 10 years and a century is 100 years