Answer
1.→Ten pizzas are shared equally among five people, and you want to know how much each person gets.

2.→Five pizzas are shared equally among four people, and you want to know how much each person gets.

3.→Zero pizzas are shared equally among five people, and you want to know how much each person gets.

4.→Four pizzas are shared equally among zero people, and you want to know how much each person gets.
4÷0=Not Defined
⇒Option 4, has No Solution.