how many fifths of liquor in a gallon
A fifth is a unit of volume formerly used for distilled beverages in the United States, equal to one fifth of a US liquid gallon, ​ ⁄ quart, or 25 ⁄ US fluid ounces (757 ml); it has been superseded by the metric bottle size of 750 ml, sometimes called a metric fifth, which is the standard capacity of wine bottles worldwide and is approximately 1% smaller.