Water Jug riddle
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You have two jugs. One jug has a content of 3 litres and the other one has a content of 5 litres.
How can you get just 4 litres of water using only these two jugs?
(There is plenty of water available to refill the jugs) 
To begin with fill up 3 litre jug and pour it into 5 litre jug. again fill up 3 litre jug and pour it into five ltre jug as much as it can fill. now 3 litre jug has one litre water remaining in it. Now pour all water in five litre jug back to source. then pour one litre water from 3 litre jug. Again fillup 3 litre jug. pour all water into 5 litre jug. Now five letre jug has four litre water in it.
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