there are 10 decades in one century so therefore 10 times 4 is 40
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400/10 = 40
70 decades
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.
A decade is 10 years and so 40 times 10 = 400 years which is 4 centuries
20 decades are in 2 centurarys