3 3/15+4 and 2/

I'm terrible at math I need some help on this one 2

3 3/15 + 4 2/?

I have no idea what is missing, but let's say you have

3 3/15 + 4 2/5
= 3 1/5 + 4 2/5
= 3+4 + 1/5 + 2/5
= 7 3/5