30 years = 3 decades so 1 year = 1/30 or 0.0333... lots of 3 decades.
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1 year = 12 months so 3 decades = 3*10 = 30 years = 30*12 = 360 months!
77 decades and 1 year 77.1 x 10 = 771
20
It is 3 decades, because it is 30 years.
1560