The population of the bird for the next five weeks based on the information is 80.
The information is incomplete. Therefore, an overview will be given. Let's assume that the population of the birds was 100 and the birds reduce by 5 every week.
Therefore, the number of birds by the fifth week will be:
= a + (n - 1)d
where,
a = 100
n = 5
d = -5
= a + (n - 1)d
= 100 + (5 - 1) -5
= 100 - (4 × 5)
= 100 - 20
= 80
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