What is the difference between 76.82 and 2.761? 49.210 74.679 74.059 79.581

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Extra points! find the missing dimension! need asap

Have yall ever just farted and was like, i farted.