15 is.
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If you start with 1, the common factors are 1 and 3. If you start with zero, as Fibonacci did, the common factor is 1.
No but 15 is a factor of 75
No but 15 is a factor of 60
well one fourth equals 25% so multiply 60 by .25 and you get 15. 15 is one fourth of 60
A fourth of an hour is 15 minutes. Hope this helped!