Which of the following describes experimental probability?

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?

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Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?