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If a country's old-age dependency ratio is 40 and its working-age population is 40 million, what is the elderly population?

Answer and explanation

Correct answer: 16 million

An old-age dependency ratio of 40 means that the elderly population equals 40 people for every 100 people of working age. The formula is \(\text{ratio}=\frac{\text{elderly population}}{\text{working-age population}}\times100\). Rearranging it gives elderly population equal to \(\frac{40}{100}\) of the working-age population.

The working-age population is 40 million, so the elderly population is \(0.40\times40=16\) million. Sixteen million is 1.6 crore, because one crore equals ten million. Therefore, option B is correct. The ratio is not 40 percent of the total population; it is 40 percent of the working-age population, which is why the denominator must be used carefully.

Related tags

Old Age DependencyElderly PopulationRatio CalculationPopulation PlanningAge StructurePopulation CompositionGeographyClass 12 Mcq

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