The school bought 815 basketballs, and the average distribution to all classes in the school is 15 more. We also know that the number of classes in the school is less than 30. Do you know how many basketballs each class gets at least?
学校购买了815个篮球，平均分给全校所有班级还多15个，又知道全校的班级数不满30个，你知道每班至少分到了多少个篮球吗？
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