Divide the wine among the drunks
We follow these steps:
We filled the 3 liter canister.
We pass the 3 liters to the 5 liter canister.
We refilled the 3 liter canister.
We fill the 5 liter container with the other, and there will be 1 in 3.
We emptied the one of 5 into the barrel.
We filled the liter of the small bowl into 5.
We fill the one with 3 and empty the one with 5, which, as I already had 1, will have 1 + 3 = 4.
In the barrel left 4 liters for the other friend.
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