Question 2
Pantellis walks past N piles of logs. The number of logs increases along his walk, and each consecutive increase is either x or y. For example, if a pile contains 5 logs and x=3, y=4, the next pile contains 8 or 9. He wants to determine the possible size of the last pile. There are N=9 piles, x=4 and y=5; the first pile contains no logs. What range contains the possible number in the last pile?
