King School has an enrollment of 900 students. The school day consists of 6 class periods during which each class is taught by one teacher. There are 30 students per class. Each teacher teaches a class during 5 of the 6 class periods and has one class period free. No students have a free class period. How many teachers does the school have?
25
30
36
60
150
class period不知道什么意思;900个学生,每个班有6个课时,每个班有30个学生,每个老师教一个class,教5个休一个,900/30=30个班,30*6=180课时,180/5=36个老师。。。
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