A school has 9 periods a day each of 50 minute duration. How many periods will there be if the duration of every period is reduced by 5 minute

Dear Student,
9 periods of 50 minutes eachso total duration of school = 9×50 minutesif each period is reduced by 5 minutes i.e. (50-5) minutes/period=45 minutes/periodso, new time duration of each period = 45 minutesso,New no. of periods=total school durationNew time duration of each period=9×50 minutes45 minutes/period=450 minutes45 minutes/period= 10 Periods 
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