ok i dont know how to do percents and i need to know if a girl reads 9 pages and it eguals 20 percent how much is in her Ô ​

So let's say that at the moment the girl has read 9 pages (just like you have stated). In order to figure out the answer, you would find the percent (20%), then you would see how many pages she has read at the moment (9). Now that you know how many she has read in 0.20 of the book, you can figure out that the rest of the 0.80 has to be 4 more of the 0.20. Multiply the 9 by 4 (since 4 0.20s have to be added to equal the 0.80) and then you get 36. Add 36 to 9 and you get 45. The girl in the question that you have asked has 45 pages in her book, meaning that she still has to read 36 to reach the end of her book.