One lb of pulled pork usually makes up to 3 pulled pork sandwiches.
So if you need 30 pulled pork sandwiches then you would need at least 10 lbs of pulled pork to make 30 sandwiches.
So if you have 1 lb of pulled pork you could make 3 sandwiches and so you figure 3 pulled pork sandwiches to every 1 lb of pulled pork.
If you need 60 pulled pork sandwiches then you would need 20 lbs of pulled pork to make enough sandwiches.
But for 1 lb of pulled pork you get at least 3 sandwiches.