How many fifths of liquor equal to half gallon?

Here's how to solve this:

* A gallon is 128 fluid ounces.

* Half a gallon is 64 fluid ounces.

* A fifth of liquor is 25.6 fluid ounces.

To find out how many fifths equal half a gallon, divide the total fluid ounces in half a gallon by the fluid ounces in a fifth:

64 fluid ounces / 25.6 fluid ounces/fifth = 2.5 fifths

Therefore, 2.5 fifths of liquor equal half a gallon.