Yesterday, Joe's Snack Shack went through 8 bottles of ketchup. If they used 1/5 as much mustard as ketchup, how many bottles of mustard did they go through?

2 bottles (8/5=1.6). So in the second bollle, it has slightly less than 1/2 left. Put it in the Fridge.

To determine the number of bottles of mustard used, we need to find 1/5th of the number of bottles of ketchup used.

Step 1: Calculate 1/5th of 8 bottles of ketchup.
Since 1/5th is the same as dividing by 5, we divide 8 by 5:

8 / 5 = 1.6

Step 2: Round off the result to the nearest whole number.
Since we can't have a fraction of a bottle, we round up to the nearest whole number:

1.6 rounded up = 2

Therefore, Joe's Snack Shack used 2 bottles of mustard.