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If elderly people form 16 percent and the elderly dependency ratio is 20, what is the working-age share if the ratio is based on these two groups?

Answer and explanation

Correct answer: 80 percent

The elderly dependency ratio is defined as elderly population divided by working-age population, multiplied by 100. The elderly share is 16 percent and the ratio is 20, so if the working-age share is \(W\), then \(\frac{16}{W}\times100=20\). Solving this equation gives \(1600=20W\), and therefore \(W=80\) percent.

Thus, option C is correct. A quick population check shows that 16 percent elderly and 80 percent working age leave 4 percent for other age groups, which is not contradictory because the question asks only for the working-age share implied by the stated ratio. The ratio must not be read as a direct 20 percent population share; it is measured relative to the working-age denominator.

Related tags

Elderly Dependency RatioWorking Age ShareRatio EquationAge StructurePopulation CompositionGeographyClass 12 McqRdgdfgdfg

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