10 years = 1 decade
20 years = 2 decades
30 years = 3 decades
.
.
etc.
well a decade is 10 year so 2 decades will be 20 years
Twenty 200 / 10 = 20
20 years.
20 years.
There are 20 decades.
There are 3.5 decades in 35 years
There are 5 decades in 50 years.
230 years = 23 decades
a decade is ten years so 3 of them would be thirty(30) years. thirty
60 years = 6 decades.
A decade is ten years So 20 years is two decades
2 decades after 1620 is 1600 because 1 decade is 10 years so 2 decades must be 20 so 1620 + 20= 1640