Select the correct answer​

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?

Solve: 3x+y=6 4x-2y=18 show all work !

17 in long 1.3 ft wide and 8in high what is the volume