70 years
1 decade = 10 years
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There are 70 decades in 7 centuries. This is because each century consists of 10 decades, so when you multiply 7 centuries by 10 decades, you get a total of 70 decades.
70 decades
A decade is ten years, so 7 decades in 70 years.
Nope - four score and seven years is 87. Which is eight decades.
A decade is a period of 10 years. Therefore, 7 decades would be equal to 70 years. This is because you would multiply the number of decades (7) by the number of years in a decade (10) to get the total number of years (7 x 10 = 70).