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Assuming a 90 year spell includes 22 leap years, the number of days is equal to (68 x 365) + (22 x 366) = 24820 + 8052 = 32872 days. If the 90 year spell includes 23 leap years, the number of days is equal to (67 x 365) + (23 x 366) = 24455 + 8418 = 32873 days. 3 people found this useful.
in one decade there are 10 years, so if you times 10 by 4 you will get 40 so there are 40 years in 4 decades. Contribution. well Dec means ten and if there is 90 years there is 10x9 which is 90 so there is 9 decades in 90years... simples îîîhow old are youÂ¿ none of your business i luv u ca â¦ meron palanca.