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If an area has 80 births, 50 deaths, and net migration of 20, what will be the total population change?

Answer and explanation

Correct answer: 50

Direct answer: B, 50. Solve it step by step using the population-change relationship: population change = births − deaths + net migration. First, subtract deaths from births: 80 − 50 = 30. This is the natural increase. Next, add the net migration of 20: 30 + 20 = 50. Therefore, the population increases by 50 people, assuming the figures refer to the same period and net migration is positive. Option A, 30, is wrong because it counts only the natural increase and ignores migration. Option C, 100, is wrong because it adds the figures without subtracting deaths correctly. Option D, 150, is wrong because it treats all numbers as additions. Memory cue: births add, deaths subtract, and positive net migration adds; use the signs before calculating.

Related tags

Population ChangeCalculationNet MigrationBirths And DeathsProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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