Answer:
275 minutes
Step-by-step explanation:
1. 20% = 20/100
2. 55 minutes is a portion of the TOTAL amount of school so as a fraction is can be said as 55/x
3. now set up the proportion
20/100 = 55/x
we know this because 55 minutes = 20% of a school day
4. solve using cross multipication
20/100 = 55/x
20(x)=55(100)
20x=5500
x= 5500/20
x= 275
I hope this helped!
