Pouring and measure

I have two containers, one of 11 liters and one of 9 liters and a water tap.
How could I get exactly 5 liters ?
Solution   Details

With one 8 liters and one 11 liters container, get twice as much water in one container than in the other.
Solution   Details

The previous method wastes water from the fountain as we threw away at least 11 liters in the 1st problem.
I have three containers, 19, 13 and 7 liters. How to measure exactly 10 liters in each of the two first ones, without spilling water outside the containers ?
Solution   Details


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