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1. If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 20 minutes?
- A. 80
- B. 80
- C. 80
- D. 80
Answer: Option A
Explanation:
Population increased in 15 sec = 1
Population increased in 60 sec or 1 min = 1×4 = 4
Population increased in 20 min = 4×20 = 80
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