5/15 is equivalent to 1/3
2/5
4/5
9/15 = 3/5
12/15 = 4/5 by dividing the numerator and denominator by 3
(4/5)/(16/15)(4/5)*(15/16)3/4 = 0.75
.8
9/15 - 1/3 9/15 - 5/15 = 4/15
7/3
152/15
2/15 is the simplest form.
2/15 is in its simplest form.
That's it. It can't be reduced any further.