Dongdong read a book with 108 pages, nine pages a day, starting from August 20th. He could finish the book before school started on September 1st. Calculating that it would take 108 pages to read 9 pages per day, 9 pages per day = 12 days. Since it started on August 20th, one more day was needed: 108 pages/9 pages/day + 1 day = 12 days Therefore, Dongdong needed 12 days to finish reading this book. He could focus on speeding up his reading in the last few days before school started and try to meet the deadline.
It is difficult to accurately predict whether Xiao Ming will be able to finish reading the 125-page book between August 20th and September 1st. This is because the speed of reading, the time spent reading, and other factors may affect his progress. However, we can do some analysis and estimations. Reading 10 pages a day meant that Xiaoming would need to spend about 125 days a day to finish reading a 125-page book. Taking into account the time he can spend every day, we can cut this time in half, which is 275 days a day. The number of days that Xiao Ming needs to read between August 20th and September 1st is: August 20-August 29 = 5 days August 30-September 5 = 5 days September 6-September 10 = 3 days September 11-September 15 = 2 days September 16-September 18 = 1 day September 19-September 23 = 2 days September 24-September 27 = 1 day Therefore, Xiao Ming needed to spend about nine days to finish reading the book before September 1st. Although this estimation result is not accurate to the end of the day, it can help us roughly predict whether Xiao Ming can complete the reading task within the specified time.
If Xiao Ming reads 15 pages a day, the total number of pages he needs is: 15 pages/day x 24 days = 360 pages Therefore, Xiao Ming needed to read 360 pages to finish it in 24 days. The number of days required to read 20 pages a day is: 20 pages/day x days = 20 days Therefore, Xiao Ming needed to read for 20 days to finish the book.
Xiao Ming reads a novel. If he reads 35 pages a day, he will finish the whole book one day later than the stipulated date. If he reads 40 pages a day, he will read 5 pages less on the last day. We can set the total number of pages of the novel as x and the specified date as d, then the total number of pages that Xiaoming needs to read is x/35 + x/40 - 1. According to the question, Xiaoming needs to read d books, so there are: x/35 + x/40 - 1 = d Transferring the terms of the equation gave: x/100 = d Therefore, Xiao Ming needed to read 100 pages a day to finish the novel by the stipulated date. If you read 35 pages a day, you would need an extra two days to finish the novel. If you read 40 pages a day, you would need an extra three days to finish the novel. After considering all, Xiaoming needed to read 37 pages a day to finish the novel according to the stipulated date. On the last day, he had to read 5 pages less.
Read a 100-page book, nine pages a day, starting on August 22nd. Can he finish the book before school starts on September 1st? It was difficult to guarantee that he could finish reading the book before school started on September 1st because reading only nine pages a day was relatively slow. It would take a few days to finish reading the book, depending on the reading speed and time. If one could read nine pages a day and maintain a high efficiency reading habit, it would take about 10-15 days to finish the book before school started. Of course, this was only a rough estimate. The exact time needed to be calculated according to the actual situation.
Li Qing needed to read 10 pages a day for a total of $128 $days. Since he needed to study for 30 days, he needed to rest for another three days. August 20th to the 30th day, before school started on September 2nd, they needed to rest for three days. Therefore, Li Qing needed to start reading on September 6th (Day 31). Li Qing needed to read $128+3+ 3 + 3 + 3 + 3 + 3+3=20$days to finish reading this book. Therefore, he needed to start reading on September 6th and finish reading the book before September 18th (the 25th day).
The number of pages that Xiaoming reads on the first day is 20% of the whole book. The number of pages that he reads on the second day is 20% of the remaining pages. The percentage of the number of pages that he reads on the second day can be calculated as follows: The number of pages that Xiaoming read on the first day was 20% of the entire book. In other words, the total number of pages that Xiaoming read was: Total pages = 20% × pages of the book = 02 × pages of the book The number of pages that Xiao Ming read the next day was 20% of the remaining pages. In other words, the total number of pages that Xiao Ming read was: Total pages = 20% x Remaining pages = 02 x Remaining pages Then, the percentage of the number of pages that Xiao Ming read the next day in the total number of pages in the book can be calculated as: The number of pages Xiao Ming read the next day divided by the total number of pages in the book × 100% = 02 divided by 08 × 100%= 25% Therefore, the number of pages that Xiao Ming read the next day accounted for about 25% of the total number of pages in the entire book.
Xiaofang reads a 175-page science book, nine pages a day, starting from August 12th. Can he finish reading this book before September 1st? Although she read nine pages a day, Xiaofang needed to finish 175 pages to get a total of 264 pages of reading progress. Therefore, Xiaofang needed to read a total of 264 pages between August 12th and September 1st, which was about 10 days. Xiaofang could read 9 pages a day, so she needed to read 18 pages a day to catch up. Xiaofang needed to read 180 pages in 10 days, which was three days longer than reading nine pages a day. Therefore, Xiaofang needed to finish reading 180 pages by August 31st. In summary, Xiaofang could finish reading this book before September 1st.
Let's say the book has $x$pages. Xiao Gang reads $56$pages a day, so the number of pages needed to finish the book in four days is $56/times 4 = 216$pages. The remaining pages are $3/11$of the book, which means that the remaining pages are $216/div3/11 = 80$pages. Because Xiao Gang still needed to read for four days, the total number of pages he needed to read was $80 + 4 = 84$pages. Therefore, the book has a total of $x = 84$pages.