Are you asking about the meaning of "fourth floor" in online literature? In online literature," fourth floor " usually referred to a section of Qidian Chinese Network, which was the " fourth floor original literature section." This section was an important part of Qidian Chinese Network. It gathered many excellent original literary works, including novels, essays, poems, and so on.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
There were a total of 218 books on this bookshelf.
If there were x books on the lower shelf, then there were 2x+18 books on the upper shelf. According to the question conditions, the number of books on the upper shelf was twice as many as that on the lower shelf.
2x+18 = 2(x+18)
Solve the equation:
x+18=x+36
x=48
Therefore, there were 48 books on the lower shelf and 84 books on the upper shelf. In total, there were 218 books.