Pumpkin Patch?

I planted pumpkin seeds in my backyard. They are all growing perfect and there are probably 20 new little shoots. There are Jack-be-littles, Sugar pie, and Jack-O-Lantern pumpkins (those were the names on the seed packs!). For each Plant grown, how many pumpkins will grow on each plant if you water, fertilize, and keep well-pruned? Thank you! (also they won't be crowded as they get older...)