Answer :

Let the weight of box A be x kg

Then,


Weight of Box A = Weight of Box B +


Weight of Box A = Weight of Box B +


Weight of Box B =


And weight of Box C = weight of Box B +


weight of Box C =


Weight of box C =


Now,


The total weight of three boxes = =


Now,


Total weight = Weight of boxes (A+B+C)







Hence, the weight of Box A =


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