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1 gal Imp. = 19.22 cup
1 cup = 0.052 gal Imp.
Definition of U.K. gallons of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).
Definition of US cup of water provided by WikiPedia
Pne U.S. cup of water weighs approximately 81⁄3 avoirdupois ounces. Since an imperial cup of water weighs approximately 10 avoirdupois ounces and five imperial cups are approximately equal to six U.S. cups