Phillip R. answered • 09/16/14

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fill the 7 liter pail and pour it into the 4 liter pail leaving 3 liters behind.

transfer the 3 liters to the 4 liter pail.

fill the 7 liter pail again and pour it into the 4 liter pail with the 3 liters already in it.

It will take 1 liter and leave 6 liters remaining in the 7 liter pail.

Empty the 4 liter pail.

Transfer the 6 liters into the 4 liter pail leaving behind 2 liters in the 7 liter pail

You have your 2 liters