reasoning Maths Puzzle Logical Reasoning Blood Relations

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

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Suppose 4 bottles are A,B,C and D. A and B are 10 liters bottle and C is 5 liter and D is 4 liter bottle.
Scene 1: A=10 B=10
C=0 D=0

Scene 2: A=10 B=6
C=0 D=4

Scene 3: A=10 B=6
C=4 D=0

Scene 4: A=10 B=2
C=4 D=4

Scene 5: A=10 B=2
C=5 D=3

Scene 6: A=10 B=7
C=0 D=3

Scene 7 A=10 B=7
C=3 D=0

Scene 8 A=6 B=7
C=3 D=4

Scene 9 A=6 B=7
C=5 D=2

Scene 10 A=6 B=10
C=2 D=2
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