Maths puzzle Thursday/Friday

A farmer is working in a field. He has an empty 5 litre can and an empty 3 litre can. There are no markings on the cans but they measure 5 litres and 3 litres accurately. The problem is the farmer wants to mix some weedkiller with exactly 4 litres of water (there is a well in the field). How will he measure 4 litres?

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