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If 15 percent of a country's population is aged 65 and above and the old-age dependency ratio is 30, what is the working-age share?

Answer and explanation

Correct answer: 50 percent

The old-age dependency ratio compares the elderly population with the working-age population. It is calculated as elderly population divided by working-age population, multiplied by 100. Here the elderly group is 15 percent of the total population, and the ratio is 30.

Let the working-age share be W percent. Then \(15/W\times100=30\). Dividing by 100 gives \(15/W=0.30\), so \(W=15/0.30=50\) percent. The remaining population consists of other age groups, such as children, but that does not alter the calculation. Therefore option B, 50 percent, is correct. The ratio is not calculated by simply subtracting 30 from 15, because it is a relative measure with the working-age group as its denominator.

Related tags

Old Age DependencyWorking Age ShareRatio CalculationAge StructurePopulation CompositionGeographyClass 12 Mcq

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