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If an area has a population of fifty lakh and a density of one thousand persons per square kilometre, what will be the area?

Answer and explanation

Correct answer: Five thousand square kilometres

Correct answer: A, five thousand square kilometres. The basic formula is density = population ÷ area. When area is required, rearrange it as area = population ÷ density. Fifty lakh equals 5,000,000 people, and the density is 1,000 persons per square kilometre. Therefore, area = 5,000,000 ÷ 1,000 = 5,000 square kilometres. The unit is square kilometres because the question gives density per square kilometre. B is too small and would correspond to a different division. C is ten times the correct result, and D also does not satisfy the formula. Check the answer by multiplying: 5,000 square kilometres × 1,000 persons per square kilometre = 5,000,000 persons. Memory cue: if population and density are known, divide population by density to find area.

Related tags

Area From DensityPopulationDensity FormulaPopulation DensityGeographyClass 9 Mcq

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