Can you show in a visual way ? Like graph or table ?

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

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?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?