we are going to create a table in excel and we will assign different values of topping to know when the price is equal in both pizzerias
see the attached figure
the answer is
5 toppings from palanzio’s pizzeria
6 toppings from guido’s pizza
cost palanzio’s pizzeria----> 6.80+0.90*5-----> $11.30
cost guido’s pizza------> 7.40+0.65*6----------> $11.30