it is no impossable unless someone drops it which is highly unlikely=(

Fill the seven litre jug. Empty into 9l jug. Refill 7 litre jug and empty into 9l jug. 7l jug now contains 5l, whilst 9l jug is full. Empty 9l jug. Pour contents of 7l jug into 9l jug. Refill 7l jug and empty into 9l jug. The remainder in the 7l jug will be 3 litres

In Runescape a wine Jug is Simply Referred to as a Jug :)

Fill 7 Ltr jug from well 7 Ltr jug ->(pour into) 5 ltr jug Unplug the 5 ltr jug 7 ltr jug -> 5 ltr jug fill 7 ltr jug from the well. 7 ltr jug -> 5 ltr jug unplug the 5 ltr jug (You will have 4 lrs in the 7 ltr jug and nothing in the 5 ltr jug) 7 ltr jug -> 5 ltr jug fill the 7 ltr jug from the well 7 ltr jug -> 5 ltr jug You will have 6 ltrs of water in the 7 ltr jug which you can put on the lever to open the gate Shailesh Singh Pakuranga, Auckland

In Runescape a wine Jug is Simply Referred to as a Jug :)