The school student council sponsored a switch day where students were able to switch classes every 20 minutes. the students are in school for 7 hours. if a student switched as often as possible, how many classrooms in all did that student visit? (hint there are 60 minutes in 1 hour)

21 classes, because if the school hours are 7 hours long it would be 21 classes

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.