12/15 = 4/5.
yes-to 3 over 12
12 over 15 4 over 5
15/12
12/35 (180/15 / 525/15)
124/15 cannot be simplified further.
15/43 is simplified.
12 over 91 can't be simplified.
It can not be simplified further.
15/48 is simplified to 5 over 16
12/4 = 12 ÷ 4 = 3
12 over 63 simplified = 4/21