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If a district's population doubles and its area becomes half, how will population density change approximately?

Answer and explanation

Correct answer: Density will become four times

Correct answer: C. Use the formula: population density equals population divided by area. Suppose the original population is P and the original area is A. The original density is P divided by A. After the change, the population is 2P and the area is A divided by 2. The new density is 2P divided by A/2, which equals 2P multiplied by 2/A, or 4P/A. Therefore, the new density is four times the original density. C is correct because it accounts for both changes. A considers only the reduction in area incorrectly, B ignores both changes, and D has no basis because the population is still present. A useful method is to track numerator and denominator separately: doubling the numerator doubles the ratio, while halving the denominator doubles it again.

Related tags

Density FormulaRatioArea And PopulationPopulation DensityPopulationGeographyClass 9 Mcq

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