Okay is 10 or 12 pizzas good enough for a crowd of 25 to 35 people .... more details?

okay i ordered 10 lrg pizzas from cici's pizza and each pizza has 10 slices so i have 25 30 or at least 33 people coming to my birthday party soo theres a 100 slices all in 10 pizzas would that be enough because my hubby says people might grab 2 or 3 slices when in line and etc.. but we're also having the pasta and salad cake and ice creamm so i was wanting some advice of how many pizzas i need for 25 to 30 people THANKYOU