Problem. Favorite book.
Arthur's favorite book has 90 pages. Arthur set out to read the book in 10 days. How many pages should he read per day if he read 9 pages a day in the first 2 days?
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Exemple !
Arthur's favorite book has 170 pages. Arthur set out to read the book in 17 days. How many pages should he read per day if he read 10 pages a day in the first 4 days?
4 x 10 = 40, pages read in the first 4 days
170 - 40 = 130
17 - 4 = 13, number of days left
130 : 13 = 10