Measure 4 Liters out of two vessels that are of 5 Liters and 3 Liters

Question

Accepted Answer

Fill the 5-litre vessel completely.
        5-litre vessel: 5 litres
        3-litre vessel: 0 litres

Pour from the 5-litre vessel into the 3-litre vessel until the 3-litre vessel is full.
        5-litre vessel: 2 litres (5 - 3 = 2)
        3-litre vessel: 3 litres

Empty the 3-litre vessel.
        5-litre vessel: 2 litres
        3-litre vessel: 0 litres

Pour from the 5-litre vessel into the 3-litre vessel again.
        5-litre vessel: 0 litres (2 - 2 = 0)
        3-litre vessel: 2 litres (2 litres poured in)

Again, fill the 5-litre vessel completely.
        5-litre vessel: 5 litres (5 litres poured in)
        3-litre vessel: 2 litres

Pour from the 5-litre vessel into the 3-litre vessel until the 3-litre vessel is full.
        Since the 3-litre vessel already has 2 litres, it can only take 1 more litre from the 5-litre vessel, leaving you with 4 litres in the 5-litre vessel.
        5-litre vessel: 4 litres (5 - 1 = 4)
        3-litre vessel: 3 litres

Final Measurement

At this point, you have exactly 4 litres in the 5-litre vessel.

Measure 4 Liters out of two vessels that are of 5 Liters and 3 Liters

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