Final answer:
To find the total number of pizzas made last week, set up a proportion using the information given: 0.09/x = 27/x. Solve for x to find that 300 pizzas were made last week.
Step-by-step explanation:
To find the total number of pizzas made last week, we can set up a proportion using the information given. Let x represent the total number of pizzas:
9% (or 0.09) of the pizzas had extra cheese, so we can set up the proportion 0.09/x = 27/x. Cross-multiplying, we get 0.09x = 27, and dividing both sides by 0.09, we find that x = 300.
Therefore, 300 pizzas in total were made last week.