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If an area's population and area both increase in the same proportion, what will happen to density?

Answer and explanation

Correct answer: Density will remain approximately the same

Correct answer: A, density will remain approximately the same. Population density is a ratio: density = population ÷ area. Suppose an area has P people and area A, giving density P/A. If both quantities double, the new density is 2P ÷ 2A, which simplifies to P/A, the original value. The same reasoning works for any equal multiplication factor, provided the comparison uses the same kind of area and population data. B is wrong because doubling both numerator and denominator does not double the ratio. C is wrong for the same reason: the denominator has not grown faster than the population. D is impossible in this situation because both quantities remain finite. In real data, the reported value may change slightly because of rounding or boundary changes, so “approximately” is sensible. Memory cue: equal growth in the top and bottom of a fraction leaves the fraction unchanged.

Related tags

Ratio ThinkingPopulation AreaDensity SamePopulation DensityPopulationGeographyClass 9 Mcq

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