If a country has a population of 20,000,000 and its size is 1,000,000 km2 then its population density is

Analyze the question: You are asked for the population density of a country, given its total population and its land area.

Concept: Population density is the average number of people living in each unit of area (usually per km²).

Population density = Total population ÷ Total area

Solution:

• Population = 20,000,000
• Area = 1,000,000 km²

Population density = 20,000,000 ÷ 1,000,000 = 20 persons/km²

Answer: The correct option is C. 20 persons/km².

Tip: When dividing numbers with many zeros, cancel the same number of zeros from the top and bottom. Here, 20,000,000 ÷ 1,000,000 becomes 20 ÷ 1 = 20. Also remember that density is always "people per area," so the population always goes on top.