self Maths Puzzle

How can you measure out exactly 4 litres of water from a tap using a 3 litre and a 5 litre bucket?

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self Other Question

2 men and 2 boys need to cross a river in a boat big enough for 1 man or 2 boys. How do they do it? A 24 litre bucket is full of lemonade. 3 men want to have equal amounts of it to take home, but they only have a 13 litre, a 5 litre and an 11 litre bucket. How do they do it?