Three Men Riddle Reel

Three men sat in a parlor,

Sitting on 10 barrels of ale,

One Red,

One Blue,

One Green.

They each had two glasses of of sherry and wine,

Sampling from barrels they Proclaimed It quite fine.

With a barrel in each Hand, They all spun around,

Laughing and throwing the beer on the ground.

Now Red had Blues,

And Green Had reds,

But Green Had three Casks You see.

 Now Red Had one,

And blue Had two,

But Green Had No Idea,

That Gray Had Come In, And stolen a keg and three.

If one keg is worth two barrels,

And a glass is 1 over 3

How Much Is Left for me?

-=-=-Comment Answer Below