If the population of a certain country increases at the rate of one person every 15 second, by how many persons does the population increase in 20 minutes?

If the population of a certain country increases at the rate of one person every 15 second, by how many persons does the population increase in 20 minutes? Correct Answer 80

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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