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

Answer and explanation

Correct answer: Four hundred persons per square kilometre

Population density is found by dividing the total population by the total area. The answer must be expressed as persons per square kilometre when the area is given in square kilometres. Here, forty lakh means 4,000,000 people, and the area is 10,000 square kilometres. Therefore, density is calculated as \(4,000,000 \div 10,000 = 400\) persons per square kilometre. This means that, on average, 400 people live in each square kilometre.

Option A is correct. A quick way is to cancel four zeroes from both numbers: 40 lakh divided by 10,000 gives 400. Option B is half the correct value, while C and D are larger values caused by incorrect division. The important point is to use population as the numerator and area as the denominator, and to retain the correct unit.

Related tags

Density CalculationForty LakhZero Counting

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