Plug in numbers: Let 1,200 = population of State X and 600 = population of State Y. Let the population concentration of State X = 12, and the population concentration of State Y = 4. The area of State X is thus
population
area
=
1200
area
= 12 → area = 100. The area of State Y is thus
population
area
= 600area = 4 → 150 area = 150. The ratio of the area of State X to the area of State Y is thus