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It depends what you want 21 days to be a fraction of.

Most commonly, if you mean a fraction of a week:

1 week = 7 days

So:

21 days ÷ 7 days = 3 weeks

As a fraction:

21/7 = 3

So 21 days = 3 whole weeks, or 3/1 as a fraction.

If you mean a fraction of a month or year, it would be different.

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Andrei Lukas

Lvl 5
5d ago

What else can I help you with?