Both are acceptable.
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2/7 of a week would be two days since a week is seven days, two 'parts' of a week would be two days.
6 days per week x 52 weeks per year = 312 days per year
Each day is 1/7 of a week (because there are 7 days per week).
The best way to go about remembering how many days are in the week is to memorize that there are 7 days per week.
There are 7 days in a week 84 days/ 7days per week = 12 weeks