Luis wants to read a 230 page book. On the first day he reads 21 pages he would like to finish the book in 14 days. If he reads equal amounts the rest of the week how many pages should he read in those 14 days?
On the first day he read 21 pages and would like to finish the 230 pages in 14 days, he has to read 230-21 = <<230-21=209>>209 pages in 13 days.
He will read 209 pages in 13/13 = <<13/13=1>>1 day reading.
He will read 209/13 = <<209/13=16>>16 pages each day. Answer: \boxed{16}.