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1 lb wt. = 1.92 cup
1 cup = 0.52 lb wt.
Definition of pounds of water provided by Merriam-Webster
any of various units of mass and weight; specifically : a unit now in general use among English-speaking peoples equal to 16 avoirdupois ounces or 7000 grains or 0.4536 kilogram
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