Question: how many fifth are in a gallon?
Answer: A fifth is a unit of volume formerly used for wine and distilled beverages in the United States, equal to one fifth of a US liquid gallon, ​4⁄5 quart, or 25 3⁄5 US fluid ounces (757 ml); it has been superseded by the metric bottle size of 750 mL, sometimes called a metric fifth, which is the standard capacity of wine ...