Answer:
The amount of slices every person will eat
Step-by-step explanation:
We know each pizza has 8 slices and 10 persons will attend this party. If we consider a mean of 3 slices per person we'll need a total of 30 slices (10x3=30), now we divide these 30 slices between the 8 slices we haver per pizza in order to have the number of pizzas needed.

Since we can't order 3.75 pizzas we round this number to 4, this way we will have 32 slices. (4x8=32)
I hope you find this information useful and interesting! Good luck!