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If an area has population of ten lakh and area of two thousand five hundred square kilometres, what will be the density?

Answer and explanation

Correct answer: Four hundred persons per square kilometre

Population density is calculated by dividing the total population by the total area: \(\text{density}=\frac{\text{population}}{\text{area}}\). Here, ten lakh means 1,000,000 people, and the area is 2,500 square kilometres. The calculation is \(1{,}000{,}000 \div 2{,}500=400\). Therefore, the area has an average of 400 people living in each square kilometre. The unit must be written as persons per square kilometre because the population is divided by an area measurement.

Option B is correct: 400 persons per square kilometre. A quick check is that \(2{,}500 \times 400=1{,}000{,}000\), which returns the given population. Option A would result from an incorrect division, while options C and D are too high for the stated values. Careful conversion of ten lakh into 1,000,000 and correct division lead directly to the answer.

Related tags

Density CalculationTen LakhArea

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