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There are 40 students whose max grade is 65, and there are 70 students who got at most 80%, and there are 35 students who

There are 40 students whose max grade is 65, and there are 70 students who got at most 80%, and there are 35 students who got at most 75%. There are 100 students in the class. How many students have their grade between 75% and 80%?

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