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If 16 percent of a country's population is aged 60 and above and 20 percent is aged 0-14, what is the ageing index?

Answer and explanation

Correct answer: 80

The ageing index compares the size of the older population with the size of the child population. It is usually expressed as the number of elderly persons per 100 children. Here the elderly share is 16 percent and the 0–14 share is 20 percent. The percentages can be used as the two population groups: \(16/20\) multiplied by 100 equals 80. Thus, there are 80 persons aged 60 or above for every 100 children aged 0–14.

Choice A is correct. The calculation does not require the total population because the same total is present in both percentages and cancels in the ratio. Choice B, 36, incorrectly subtracts the percentages; choice C reverses the comparison and gives 125, while choice D uses only the elderly percentage. The index is a ratio, not a percentage-point difference, so 80 is the appropriate result.

Related tags

Ageing IndexElderly PopulationChild PopulationAge StructurePopulation CompositionGeographyClass 12 Mcq

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