Question 264077
Area of Earth is 4 x pi x 4000^2 in sq miles = 201061929.8 sq miles.
Land is 30% of this or 60318578.95 sq miles
Per person, this is 0.00900 sq miles per person
There are 640 acres per sq mile so 5.76 acres per person.
If 1/5 is arable, that is 1.15 acres of arable land per person.