The product of the difference of x and 3 and 4

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?

Answer this question only if you know the 30 points and

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys