Answer:
34
Explanation:
If there are 180 students performing you need to subtract that from 1200, which leaves you with 1020
Then you divide it by 30, since there are 30 people in each class
You should then end up with 34 classes
34 classes
First, subract 180 from 1200. You should get 1020. then do 1020/30. So 34 classes can watch the performance of 180 students.
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