129 divided 50 pls hurry

We must first determine the shape of a rectangular prisms _ a0 to find area of the prism

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?

Which fraction below is equivalent to 10/12?