Ten There are ten years in a decade.
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1 decade equals 10 years.
There are 52 weeks a year 1 decade is 10 years 52x10=520
A decade is 10 years
1 Decade= 10 years
One decade is 10 years, so 5 decades = 50 years.There are: 5*10 = 50 years because a decade is 10 years