Need help with some square feet problems

Question

As of mid-2016, the world's population was about 7.4 billion people. The population of the United States was 324 million.

The area of a certain city is 706 square miles. If in mid-2016 every person in the world moved into that city, how many square feet of space would each person have? Note: There are 5,280 feet in a mile. First, determine how many square feet are in a square mile. (Round your answer to one decimal place.)

Answer 1

27,878,400 ft² = 1 mi²

2.1187574 x 10¹⁰ ft² = 760 mi²

 

(2.1187574 x 10¹⁰ ft²) / 7.4 x 10⁹  = ? ft²/person