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How many classes are there in the evening for high school math self-study?
Section 3.

From 6: 00 to 6: 50 in the morning, there are five classes in the morning (each class is 45 minutes, and each teacher has an average delay of 5 minutes). Classes begin at 1: 30 in the afternoon, and there are three evening self-study classes at 5: 30 in the afternoon, each with 1 hour 10 minute. Only Sunday is a holiday.