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If an area has a population of thirty-six lakh and an area of four thousand five hundred square kilometres, what will be the density?

Answer and explanation

Correct answer: Eight hundred persons per square kilometre

Correct answer: B, eight hundred persons per square kilometre. Population density is calculated by dividing total population by total area. Thirty-six lakh means 3,600,000 people. Therefore, density = 3,600,000 ÷ 4,500 = 800 persons per square kilometre. The unit is important because the answer tells us how many people, on average, live in each square kilometre. A gives 600, which would result from an incorrect division. C gives 900, and D gives 1,000; neither matches the stated numbers. A safe method is to cancel zeros carefully or check the result by multiplication: 800 × 4,500 = 3,600,000. Do not divide area by population, because that reverses the meaning of density. Memory cue: density equals people divided by land area, not land area divided by people.

Related tags

Density CalculationPopulationArea UnitsPopulation DensityGeographyClass 9 Mcq

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