Lol please explain how to do this

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?

With this one. will mark brainliest

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?