If in a certain population, people are born at an average rate of 9 people every 2 seconds and people die at an average rate of 3 people every 2 seconds , by approximately how many people does the population increase in 1 day?
A. 17,280
B. 25,920
C. 129,600
D. 259,200
E. 388,800
Λύση (D):
Για να υπολογίσουμε την αύξηση του πληθυσμού αφαιρούμε από το ρυθμό γεννήσεων το ρυθμό θανάτων:
9/2 – 3/2 = 6/2 = 3 people/sec
Άρα ο πληθυσμός αυξάνεται κατά 3 άτομα κάθε δευτερόλεπτο, επομένως ανά ημέρα :
3×60×60×24=259,200
![Everyone believed the team was favored with athletic talent and a seasoned, successful coaching staff; […]](https://www.uniperfect.gr/wp-content/uploads/2021/02/verbal-1.jpg)
![Although the initial cost of installing solar panels to produce electricity can be _______, the financial benefits […]](https://www.uniperfect.gr/wp-content/uploads/2021/02/math-2.jpg)