Answer:
The two pizzas will same cost when 2 toppings are added on the pizza.
Explanation:
We are given the following in the question:
Papa's pizza:
Cost of pizza = $6.80
Cost of each topping = $0.90
Let x be the total number of toppings.
Total cost =

Little Italy's pizza:
Cost of pizza = $7.30
Cost of each topping = $0.65
Let x be the total number of toppings.
Total cost =

Equating the two equations, we get,

Thus, the two pizzas will same cost when 2 toppings are added on the pizza.