53 decades
Yup. A decade is ten years. A century is 100 years. 5 centuries are 500 years so 500 divided by 10 is 50. Add the three other decades and you get 53.
None. A centuries is 100 years, a decade is 10 years so its actually half a centuries.
50 decades
a decade is ten years, a century is one hundred years. one hundred times three is three hundred. three hundred divided by ten equals thirty
there are 30 decades in 3 centuries
30