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Use 365 days for the number of days in a year
1/3 of a year is 120 days.
A fraction requires two numbers. 21 days as a fraction of what? A month, a year, a century?
45 days is approximately 1/8 of a year.
Assuming it is a normal year with 365 days, the fraction would be 65/365 = 13/73
about 16.4%
90 days divided by 365 days = 24.6575% of the year.
35 as a fraction = 35/1
35 days
45 days is approximately 1/8 of a year.
Two days is 2/365 of a year, which works out to be one 182.5th of a year.