Question:

How many square feet of pizza are eaten in the United States each month?

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Solution:

Take your figure of 300 million people in America. How many people eat pizza? Let’s say 200 million. Now let’s say the average pizza-eating person eats pizza twice a month, and eats two slices at a time. That’s four slices a month. If the average slice of pizza is perhaps six inches at the base and 10 inches long, then the slice is 30 square inches of pizza. So four pizza slices would be 120 square inches. Therefore, there are a billion square feet of pizza eaten every month.

To summarize:

There are 300 million people in America.

Perhaps 200 million eat pizza.

The average slice of pizza is six inches at the base and 10 inches long = 30 square inches (height x half the base).

The average American eats four slices of pizza a month.

Four pieces x 30 square inches = 120 square inches (one square foot is 144 inches), so let’s assume one square foot per person.

Your total: 200 million square feet a month.