For a book, Xiao Ming read a quarter of the whole book on the first day, and the ratio of the number of pages read on the second day to the number of pages read on the first day was six to five. Two days later, there are 108 pages left to read. How many pages are there in this book?

108÷( 1- 1/4- 1/4×6/5)

= 108÷(3/5-3/20)

= 108÷2/5

=270 pages