A score is 20 years. A decade is 10 years. So in 10 decades we've had 100 years. Thus there are 5 scores in 10 decades.
10 Years/1 Decade x 10 Decades ÷ 20 years/1 score = 5 scores
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Four score years, or eight decades.
1,000 decades
Nope - four score and seven years is 87. Which is eight decades.
No. A decade is ten years. Twenty years is two decades (or a "score" -- as in "Four score and seven years ago...").
70 decades