Two decades is twenty years. You can also call it a score.
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If you mean decades then there are 10 decades in 100 years
20 decades = 2 centuries or 20*10 = 200 years
1 decade has 10 years and 1 score has 20 years, therefor there are 2 decades in a score.
2 centuries
If you mean 3/10 of a century then there are 3 decades A decade is 10 years and a century is 100 years