Henry Ernest Dudeney/Puzzles and Curious Problems/294 - The Keg of Wine

by : $294$

 * The Keg of Wine
 * A man had a $10$-gallon keg of wine and a jug.
 * One day he drew off a jugful of wine and filled up the keg with water.
 * Later on, when the wine and water had got thoroughly mixed, he drew off another jugful, and again filled up the keg with water.
 * The keg then contained equal quantities of wine and water.


 * What was the capacity of the jug?