4 bottles and water puzzle

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There are two bottles of 10 liter; each completely filled with water. Now 2 persons having empty bottles of 4 liter and 5 liter want to take 2-2 liters of water. You can use only these 4 bottles (10 liter-full, 10 liter-full, 5 liter-empty, 4 liter-empty) to transfer the water. Wasting or throwing of water is not permitted. How can this be done?

Note: It is assumed that you can not measure water level by comparing water level, or by judging, it should be exact 2 liters of water finally in each 4 and 5 liter water bottle.

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    Capacity —10 10 5 4
    Intially — 10 10 0 0
    10 6 0 4
    10 6 4 0
    10 2 4 4
    10 2 5 3
    10 7 0 3
    10 7 3 0
    6 7 3 4
    6 7 5 2

    6 10 2 2

    satyen Guru Answered on 28th July 2015.
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