4 litters

You have a five-liter jug and a three-liter jug and supply water. How can you measure exactly 4 liters? (You were allowed to throw water away).

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12 litters

There are three jugs with the sizes of 12, 7 and 5 liters. Starting with a full twelve liter of water jug and with the two empty jugs, howmany pourings do you need so that there are 6 liters in each of the two larger jugs?