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Four 7th and 8th grade classes at a school are going on a field trip. There are 20 students in each class, but 90% of them got permission to go on the trip. If the school requires 1 chaperone for every
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Four 7th and 8th grade classes at a school are going on a field trip. There are 20 students in each class, but 90% of them got permission to go on the trip. If the school requires 1 chaperone for every 8 students, how many chaperones are needed?

User Iquestionshard
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There would be 9 chaperones needed. 
User SergFSM
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