From page 4 to page 10, including: page 4, page 5, page 6, page 7, page 8, page 9, page 10, so I read seven pages.

Solution:

There are two solutions to this problem, enumeration method and formula method.

1, enumeration method

Enumeration lists all. This method is suitable for a small number of topics, such as the above problems, which can be listed in only 7 pages.

2. Formula method

The formula method is suitable for a large number of topics. For example, Peggy Piggy reads a book, and she reads 1000 page from the fourth page. At this time, it will be a lot of work if all of them are listed, so we use the formula method, that is, (1000-4)+ 1, and get 997 pages.