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?
None of them
240
150
100
80
Description (বিবরণ) :
প্রশ্ন: 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?
ব্যাখ্যা:
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
