No. Only 3 and 5 go into 15, but neither of those go into 28.
28/15 is in its simplest form.
No 28/29 cannot be reduced.
28/15 = 113/15
15/28 is in its simplest form.
51/28 can't be reduced.
28/16 = 7/4
28 / 197 .... it does not reduce
yes to 25 over 28
7/16
no
5/9 = 25/45 but not to 15/28
Unfortunately you can't. 15/28 is the simplest it will go.