Centre of mass of 3 particles 10 kg, 20 ...

Centre of mass of 3 particles 10 kg, 20 kg and 30 kg is at (0, 0, 0). Where should a particle of mass 40 kg be placed so that the combination centre of mass will be at (3,3,3)

(0,0,0)

(7.5, 7.5, 7.5)

(1,2,3)

(4,4,4)

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