Dongdong read a book on the first day, the ratio of the number of pages he had read to the number of pages he had not read was 2 to 3. The next day, he read another 30 pages, and the number of pages he had not read was this oneThe total number of pages in the book was $30+30=60$pages.
The number of pages read is $2x$, and the number of unread pages is $3x$. where $x$is an integral number.
On the first day, the ratio of pages read to unread was $2:3, so $2x=3x+30. The solution is $x=10$.
Therefore, the number of pages read is $2x=20$, and the number of unread pages is $3x=30$.
So this novel has a total of $60$pages, I've read $20$pages, I haven't read $30$pages.
Wang Qiang read a book. For the first four days, he read eight pages a day, and for the next three days, he read a total of 17 pages. How many pages did he read on average every day?Wang Qiang read a book for the first four days, eight pages a day, and then a total of 17 pages for the next three days.
We can split this situation into two parts for analysis:
Reading eight pages a day for the first four days meant that Wang Qiang had already read $4/times 8 = 32$pages in the first four days.
Reading a total of 17 pages in the last 3 days meant that Wang Qiang had read another $3/17 = 54$page in the last 3 days.
Therefore, Wang Qiang read a total of $32+54=86$pages.
Next, we need to calculate how many pages he reads on average every day.
Did he read all the books in the first four days and the last three days together? If that was the case, then the average number of pages he read every day was $86/4+17/3=265+5=315$pages. If not, then the average number of pages he read every day was $86/4-17/3=26-5=21$pages.
Therefore, Wang Qiang read an average of 21 pages a day.