Brain teaser for the week 20200704 每周烧次脑

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"A man with a number of bookshelves has distributed his book collection evenly on the shelves, putting 80 books on each shelf. If he adds 3 shelves and redistributes his collection evenly on all the shelves, each shelf will have 50 books. How many books are in his collection?"

把一批书籍平均分配放在一定数量的书架上，则每个书架有80本书。如果增加3个书架再次把这批书平均分配放在书架上时，每个书架有50本书，请问这批书有多少本？

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答案下期公布

Answer to last week 上期答案 Brain teaser for the week 20200627 每周烧次脑：

（E） 108

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