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How many years is in three decades?

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a decade is ten years so 3 of them would be thirty(30) years. thirty
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How many day in three decades?

  365x30, factor in 7 or 8 leap years, so 10,957 or 10,958 days, depending on the number of leap years.     But seriously, couldn't you have figured that out you
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How many decades is 90 years?

well Dec means ten and if there is 90 years there is 10x9 which is 90 so there is 9 decades in 90years... simples how old are you¿ none of your business i luv u ca