21 over 15 is equal to many things. first off it can be equal to 42 over 10
the way i did that was just by muliplying the numerator and denominator by two...you can do it with any number...hope this helped
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Yes.
Yes. 15/21 = 5/7. 5/7 is in simplest form.
5:7 (or 5/7) is equivalent to 10:14 (10/14) and 15:21 (15/21).
11/21 is not equivalent to 0.55
15/30 is equivalent to 1/2