5 actually, the decimal of 3/5 is equal to 0.6. if you divide 3 by 0.6, you get five. this method works for other fraction equations as well. hope this helps and sorry some retard gave you nine. honestly, check your work next time.
3
16.
123
23
23/5
5/5 + 3/5 = 8/5 8 fifths.
Sixty six.
1
15
minus three fifths
Assuming that you mean "fifths", the answer is three fifths.
15