Each class uses 200 x 5 = <<200*5=1000>>1000 sheets of paper in a week.

Thus, there are 9000/1000 = <<9000/1000=9>>9 classes in the school.

# Answer

9
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Each class uses 200 sheets of paper per day. The school uses a total of 9000 sheets of paper every week. If there are 5 days of school days, how many classes are there in the school?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
9
Each class uses 200 sheets of paper per day. The school uses a total of 9000 sheets of paper every week. If there are 5 days of school days, how many classes are there in the school?
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