Question

If every person in the world were to own an equal share of the earth’s land, how many square miles would each person have? You may assume the earth is a sphere with a radius is 3959 miles and that 20 percent of its surface is land suitable to live on. There are approximately 7.7 billion people on earth as of 2019.
a)0.0057mi^2/person
b)0.00512mi^2/person
c) 0.05mi^2/person
d)0.00483mi^2/person​

1. If every person in the world were to own an equal share of the earth’s land, the number of square miles each person would  have is: b)0.00512mi^2/person.

### Square miles

First step
Surface area of earth=4πr²
Surface area  of earth=4π(3959)²
Surface area  of earth=196,961.284 miles²
Second step
Suitable land area=20%×196,961.284
Suitable land area=39,392,256.87
Third step
Square miles=Suitable land area/Number of people on earth
Square miles=39,392,256.87/7700000000
Square miles=0.005115
Square miles= 0.00512 mile²/person (Approximately)
Therefore the number of square miles each person would  have is: b)0.00512mi^2/person.