15 5/8 divided by 5
First, we turn the 15 5/8 to a mixed number: 8 * 15 + 5 = 125/8 
125/8 divided by 5/1 (which is equal to 5) 
Next, we do Keep Change Flip. 
Keep 125/8 the same, change the division to multiplication, and turn the 5/1 to 1/5.
1 * 125 = 125 
8 * 5 = 40 
Then, we get 125/40 = 3 5/40 BUT WAIT
We can reduce it once more! Divide 40 by 5
Each friend collected 3 1/8 bags of food.