How to solve equations with fractions and variables in the denominator

Customers at your store select their groceries from shelves and then pay. sales records and records of restocks for flaming roast coffee (1 lb size) are as follows: number of bags tue wed thu fri sat sun mon sales  5  8  2 19 22 15  3 restock  6 12 12 18 24  0  0 what is the net change in how many bags are on the shelf, from the beginning of tuesday to the end of monday? (note: a negative number indicates a decrease.) –22  –2   0   2  36