The population of India is 3 times that of the US. The area of the US is 3 times that of India. What is the value of area per person as a ratio (the US to India).

India = IND
United States = US

Population = P
Area = A

1 answer

India has 1/3 the area, and 3 times the people
so its population density is 9 times the US's

so if the US's population density (people divided by area) is p/a
(3p)/(1/3 a) = 9 * p/A