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If an area has population of thirty two lakh and area of six thousand four hundred square kilometres, what will be its density?

Answer and explanation

Correct answer: Five hundred persons per square kilometre

Answer: B, 500 persons per square kilometre. Population density is calculated by dividing population by area. In the Indian numbering system, thirty-two lakh means 3,200,000 people. Now calculate: 3,200,000 ÷ 6,400. Since 6,400 × 500 = 3,200,000, the density is 500 persons per square kilometre. Another quick method is to write 32 lakh as 320 ten-thousands and divide by 6,400; the same result is obtained. Option B is correct. Option A would result from an incorrect division or from using the wrong area. Option C is too high because 6,400 × 800 would give 5,120,000 people, not 3,200,000. Option D is also too high because 6,400 × 1,000 would give 6,400,000 people. Always include the unit persons per square kilometre. Memory cue: density is people divided by land area, not area divided by people.

Related tags

Density CalculationIndian Numbering SystemPopulation Per AreaArithmeticPopulation DensityPopulationGeographyClass 9 Mcq

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