10 years are in a decade so 40 years are in 4 decades
A decade is 10 years.
10 years in a decade.
A decade is 10 years.
A decade is 10 years
There are 10 years in a decade.
there are 10 years in a decade
There are ten years in one decade.
1 decade = 10 years
10 years makes a decade
There 10 years in a decade.
Ten There are ten years in a decade.
10 years is in a decade