It is: 40/100 = 2/5 of a century
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6 decades=60 years so no its not
4/5 of a century is 80 years.
It is 1 century which is a 100 years. 6 decades is 60 years.
If you mean 3/10 of a century then there are 3 decades A decade is 10 years and a century is 100 years
1/100