Xiaoming reads a storybook, Xiaofang reads a science book. The number of pages in a storybook is 75% of that in a science book. Xiaoming reads 15 pages a day, Xiaofang reads 18 pages a day. If Xiaoming and Xiaofang had a total of 100 pages, then they would read 100 * 15 / 100 = 15 pages a day.
The remaining pages were 75% of the pages of the science book, which was 75 * 18 / 100 = 15 pages. Since the number of pages in the story book was 75% of the number of pages in the science book, the remaining pages were 75 / 75 = 1 page.
Therefore, Xiaoming and Xiaofang read a total of 15 + 1 = 16 pages a day. They only read one page a day, which meant that they couldn't read the rest of the pages.
Xiaolan had already read 2/3 of the total number of pages in the book, so she had already read (2/3) × 240 = 80 pages.
The remaining pages were 240 - 80 = 160 pages.
Therefore, there were still 160 pages left to read.
If a book has been read three-fifths of the way and there are 15 pages left, then the number of pages read is the number of pages not read:
Number of pages seen/number of pages not seen = 3/5/4/5 = 3/4
Therefore, the number of pages that had been read was four-thirds of the number of pages that had not been read.
Xiao Ming read 3/8 of the book on the first day, which was 042675 or 42675% of the book. The next day, he read 18 pages, and the remaining pages were 5/8 of the book, which was 075 or 75%.
Suppose the book has x pages:
3/5 of the total number of pages read = (x * 3/8 + 18) / x = 3/5
To simplify it:
x = 42 * 8 / 3 = 96
Therefore, the book had a total of 96 pages.
The total number of pages in this book is 101. Xiao Ming has read 80 pages and has not read the remaining 31 pages.
Therefore, the number of pages that Xiao Ming has read accounts for the total number of pages:80 pages/101 pages =08(copies)
The number of pages that have not been read accounts for the total number of pages:31 pages/101 pages =03(copies)
Therefore, there were 08 copies and 03 copies for those that Xiao Ming had seen and those that he had not seen.
If the remaining 75% of the pages of a book were read, it meant that 75% of the pages had not been read. Then, the number of pages that were read would be 25%+80% = 3/4.
The number of pages left is a fraction of the number of pages seen. It can be calculated in a similar way: the number of pages left is 1 -the number of pages seen = the number of pages left-the number of pages seen = 75% x the number of pages left divided by the total number of pages. Therefore, the remaining pages were 75% of the total number of pages. The answer was that the remaining pages were 75% of the number of pages read divided by the total number of pages.
On the first day, Xiaofang read the book's 51 pages, and the remaining pages were $51/div2 = 25$.
The next day, he read another 10 pages and the remaining pages were $25 + 10 =$35.
At this point, the ratio of pages seen to pages not seen is 2:3, which can be expressed as $25:35=2:3$.
Therefore, Xiaofang had read the book for $2+3=5$days and still had $35-5=28$pages left.
Xiaofang read 15 of the book on the first day and read 10 pages on the second day, so she read a total of ${1}{5} +{1 = 15}$pages.
Assuming that the book has a total of $x$pages, then Xiaofang has read a total of $x \times \frac{1}{5} + x \times \frac{10}{1 = 10x + 50}$pages.
At this time, the ratio of the number of pages read to the number of pages not read is 2, which means that the number of pages left by Xiaofang is twice the number of pages in the book, which is $x/times 2 = 10x + 50$.
The solution is $x = 105$, which means that the book has 105 pages.
Xiaofang read 15 pages on the first day and 10 pages on the second day. She read 25 pages in total.
If the number of pages seen is x, the remaining pages are 200-x.
According to the meaning of the question, the equation can be listed:
x = 60% (200-x)
To simplify it:
x = 60% × 200 - 60% × x
To solve the equation:
120 - 30% × x = 200
30% × x = 80
x = 240
Therefore, the number of pages he had seen was 240.