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If total dependency is 50 per 100 working-age persons and elderly dependency is 20, approximately what is child dependency?

Answer and explanation

Correct answer: 30

Total dependency is the sum of child dependency and elderly dependency. Both are measured per 100 working-age persons. The relationship is \(D_t=D_c+D_e\), where \(D_t\) is total dependency, \(D_c\) is child dependency, and \(D_e\) is elderly dependency. Substituting the given values gives \(50=D_c+20\). Therefore, \(D_c=50-20=30\) children per 100 working-age persons.

Thus, option C is correct. The figure 30 does not mean that children form 30 percent of the whole population; it is a ratio using the working-age population as the base. Option A would incorrectly treat elderly dependency as the child component, while 25 and 70 do not follow from the stated relationship. This calculation assumes that the total and elderly ratios use the same working-age denominator, which is the standard definition of dependency ratios.

Related tags

Child DependencyTotal DependencyElderly DependencyRatio CalculationAge StructurePopulation CompositionGeographyClass 12 Mcq

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