1 week = 7 days,
91 ÷ 7 = 13
so 91 days = 13 weeks
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13 weeks.
THere are 91 days in 13 weeks. 1 week = 7 days, and 7 x 13 = 91
13
7x13=91 days
There are 7 days in one week, therefore 91 days is equal to 91 / 7 = 13 weeks.