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Fill the 5 litre container and empty it into the 9 litre one. Fill the 5 litre (again) and empty 4 litres into the 9 litre container. Now - empty the remaining litre into the 6 litre container. Finally re-fill the 5 litre container and empty into the 6 litre one - and you're done.
Holes don't fill things up, they empty it
Fill the 7lt bucket and use this to fill the 3lt bucket leaving 4 lts in the 7lt bucket. Empty the 3lt bucket and then 1/3rd fill again This will leave 2lts in the 7lt bucket.
the only way is to fill it up, then emty it and count them, you will be pleasantly surprised.