At Pizza Pi, 95% of the pizzas made last week had extra cheese. If 19 pizzas had extra cheese, how many pizzas in all were made last week?

95:19=5

5% = 1 pizza

100%=20 pizzas

If you would like to know how many pizzas in all were made last week, you can calculate this using the following steps:

95% of x = 19

95/100 * x = 19 / * 100

95 * x = 19 * 100 / 95

x = 19 * 100 / 95

x = 20

Result: 20 pizzas were made last week.