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If population doubles and area becomes four times, what will happen to density?

Answer and explanation

Correct answer: Density will become half

Answer: A, density will become half. Use density = population ÷ area. Let the original population be P and the original area be S. Original density is P/S. The new population is 2P and the new area is 4S, so new density is 2P ÷ 4S = P/(2S), which is half of the original density. The population has increased, but the area has increased twice as much in relative terms. Option A is therefore correct. B is wrong because it considers the doubling of population but ignores the fourfold increase in area. C is wrong because the area, not density, becomes four times. D is wrong because the two changes do not balance: doubling the numerator and quadrupling the denominator reduces the result by half. A useful method is to compare multipliers: new density factor = population factor ÷ area factor = 2 ÷ 4 = 1/2. Memory cue: if area grows faster than population, density falls.

Related tags

Population DensityRatio ComparisonPopulation GrowthArea ChangePopulationGeographyClass 9 Mcq

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