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A decade is ten years, a non-leap year year contains 365 days, in ten years either two or three leap years will fall. Therefore in ten years there will be 10 times 365 days plus two more for the two leap years which makes 3,652 days in a decade, or three more for th three leap years which makes 3,653 days in a decade.
Leap years, from 2009 to 2019 ; 2012, 2016 = 2 days extra
Leap years, from 2011 to 2021 ; 2012, 2016, 2020 = 3 days extra
Little improvement:
A year has generally 365 days except in a leap year.
leap year has 366 days.
Leap year came after every 4 years.
so, the average days for a year are 365.25.
Decade has 10 years
so in a decade there 3652.5 days.
and in 6 decades, it would be 3625.5 X 3=21753 days
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∙ 12y ago
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