Number of pages viewed/total pages = Number of pages viewed/total pages × 100% Total pages = 55 pages + one-fifth of the book = 55 pages + 25 pages = 80 pages Number of pages viewed/total pages = number of pages viewed/80 pages × 100%= 075 Therefore, when Xiao Xiao read a book on the first day, she would read 55 pages, and the next day, she would read one-fifth of the book. The ratio of what she had read to what she had not read was about 75%.