How many reps should I do to get cut?

Number Of Repetitions

I do recommend going for about 8-12 repetitions. If you feel like doing more than go to about 15 repetitions. A lot of people like to go 20+ for even more of a cardiovascular endurance workout but that's up to you. If you go for the 8-12 repetition ranges your going to be working more on strength.

Do high reps burn more fat?

The common belief is that high reps magically gets rid of fat. While high reps with light weight to fatigue can create a muscular response, it does not necessarily remove fat better than low reps with heavy weight.