There are 107 books in the library. I borrowed 50 books on the first day and 30 books on the second day. How many books are left? How to draw this question?

There are 27 books left. Draw a straight line to mark the location of the 107 book, then mark the borrowing quantity of the first day and the second day in turn, and finally solve it.

Total number of books in the library-(number of books lent on the first day+number of books lent on the second day) = number of books left, that is, 107-(50+30)=27 (books).

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