If Cindy recycled 54 pounds of paper and it was 9 times as many pounds of paper as Monica, you can reword the problem as such:
54 (Cindy) = 9 x ___ (Monica)
In this case you can divide: 54 / 9 = 6lbs
To check your answer, you can do it this way:
2 times as many pounds as 6 is 2 x 6 = 12lbs
3 times as many pounds as 6 is 3 x 6 = 18lbs
4 times as many pounds as 6 is 4 x 6 = 24lbs (and so forth...)
9 times as many pounds as 6 is 9 x 6 = 54lbs.
I hope this helps!