Five people borrowed 5 people * 2 books/person = <<5*2=10>>10 books on the first day.

After the second day, the total number of borrowed books increased to 10 books + 20 books = <<10+20=30>>30 books.

The total number of books on the shelf after the second day is 100 books - 30 books = <<100-30=70>>70 books

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A library has a collection of 100 historical novels arranged on a shelf. 5 people borrow 2 books each from the shelf on a particular day,  and 20 more books are borrowed from the shelf on the second day. How many books are remaining on the shelf after the second day?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
70
A library has a collection of 100 historical novels arranged on a shelf. 5 people borrow 2 books each from the shelf on a particular day,  and 20 more books are borrowed from the shelf on the second day. How many books are remaining on the shelf after the second day?
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