how do I solve this proportion/ratio problem?

Question

you read a book for language arts.  Each day you record the page number of the last page you read that day. The table below shows the results. On which of the days did you read 3 pages for every 2 pages that you read on the previous day?

 

 

Day   1   2   3   4    5    6   7

page 15 35 49 70 82 100 112

Answer 1

???????? "preveious" ???????? the werd is B4 or prior

or yesterdae

pages yu reed...15, 20, 14, 21, 12, 16

21=1.5*14