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例1 高中学生的人数是初中学生人数的5/6,高中毕业生的人数是初中毕业生人数的12/17,高、初中毕业生毕业后,高、初中留下的人数都是520人。那么高、初中毕业生共有____人。(1996年“小数奥赛”初赛题)
Example 1 The number of high school students is 5/6 of junior high school students. The number of high school graduates is 12/17 of the number of junior high school graduates. After graduating from middle school, the number of high and middle school students left is 520. So high, a total of junior high school graduates ____ people. (1996 “Fraction Orsay” preliminary question)