4 over 15 is already simplified and can't be simplified further.
It is: 24/90 = 4/15 simplified
8/30 simplifies to 4/15.
15/60 = 1/4
15/4
4/15
4/15
2 over 7
3/5 & 4/15 are already simplified.
4/15 can't be simplified, it is in its simplest form.
12/15 = 4/5.
about 3 1/5 :D