Answer:
34
Explanation:
When you subtract 13 by 106 you will receive 93. Then you divide 93 by 3 and get 31. Add 3 pages to 31 and get 34. (If you're wondering where i have gotten the 3 it is from the first 3 pages Sonia paid for)
Hope this helped.
34 pages
For the first three pages, Sonia is already down 13 dollars.
106-13=93 dollars left
93/3 dollars per page =31
31+those three first pages=34 pages
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