Sorry, but without knowing what type of machine it is, it's impossible to tell. Ask your gym.
Are you a pretty strong gal? I'm pressing 50kg right now, but I'm recovering from an injury...and don't want to stress myself. I don't find it hard. I'm pretty strong though. I believe I could press 110 by working up to it....not sure, but it wouldn't be easy. So if you're strong and you found it pretty tough, it's probably the 110.
I'm used to a leg press with just one set of weights. I've never seen one with two! So I suppose that would lead me to believe that if you have two sets and you are pressing 55lb with each leg, that it's cumulative 110lb...
Well, it matters if you're going to use a different leg press sometime and need to know how much weight to put on it.
OP, if it was the sled type where you add plates to each side and then move the whole platform with plates, you lifted 110 lb PLUS the weight of the sled. You'll need to ask someone at the gym what the weight of the sled is, then add that to your total. Or there may be a sticker somewhere on it with that information.