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Question
Biology
Posted 6 months ago

Calculate the number of emigrants in a population when the absolute growth was +140 and there were 400 births, 210 deaths, and 70 immigrants.
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Answer from Sia
Posted 6 months ago
Answer
The number of emigrants is 120.
Solution
a
Calculate the net population change: The absolute growth is given as +140. This means the population increased by 140 individuals
b
Determine the natural increase: The natural increase is the difference between births and deaths. Natural Increase=BirthsDeaths=400210=190 \text{Natural Increase} = \text{Births} - \text{Deaths} = 400 - 210 = 190
c
Calculate the net migration: The net migration is the difference between immigrants and emigrants. Since the absolute growth is the sum of the natural increase and net migration, we can set up the equation: Absolute Growth=Natural Increase+Net Migration \text{Absolute Growth} = \text{Natural Increase} + \text{Net Migration} 140=190+(ImmigrantsEmigrants) 140 = 190 + (\text{Immigrants} - \text{Emigrants}) 140=190+(70Emigrants) 140 = 190 + (70 - \text{Emigrants}) 140=260Emigrants 140 = 260 - \text{Emigrants} Emigrants=260140=120 \text{Emigrants} = 260 - 140 = 120
Key Concept
Emigration calculation
Explanation
The number of emigrants is determined by considering the absolute growth, natural increase, and net migration. By solving the equation for net migration, we find the number of emigrants

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