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If children form 20 percent of a country's population and the child dependency ratio is 25, what is the working-age share if the ratio is based on these two groups?

Answer and explanation

Correct answer: 80 percent

The child dependency ratio compares the child share with the working-age share. The given ratio of 25 means that children equal 25 percent of the working-age population when expressed per 100 working-age people. Let the working-age share be \(W\). The information can therefore be written as \(\frac{20}{W}\times100=25\).

Solving gives \(20\times100=25W\), so \(W=2000/25=80\) percent. Therefore, option C is correct. The question explicitly limits the calculation to these two groups, so no separate elderly group needs to be considered. A 60 percent working-age share would produce a child dependency ratio of about 33.3, not 25.

Related tags

Child Dependency RatioWorking Age ShareAlgebraAge StructurePopulation CompositionGeographyClass 12 McqRdgdfgdfg

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