An Innkeeper purchased an odd number of wine kegs, and one keg of beer. These are shown in the picture above. The Innkeeper then sold an amount of the wine to one woman and twice this amount to another, but kept the beer to herself.
Can you figure out which keg contains the beer? (the kegs were sold just as they were purchased, without manipulating the contents)
[answers can be submitted below in the comments section if you can figure it out. To give everyone a fair chance, however, will keep submissions under wraps for about 2 days. Thanks]