It is already in its simplest form.
9/15 in its simplest form is 3/5
30/16 in simplest form is 15 over 8
It is: 15/60 = 1/4 in its simplest form
15/55 in simplest form is 3/11.
3/13
11/15
1/7
It is: 9/15 = 3/5
4 over 15 is already in lowest terms.
2x over 15
10/15 = 2/3