Total weight of A,B and C = Average × Number of persons =60×3=180kg Total weight of A,B,C and D =65×4=260kg ∴ Weight of D=260−180=80kg and weight of E=80−3=77kg ∵ Total weight of B,C,D and E=67×4=268kg ∴ Total weight of B and C =268−80−77=111kg ∴ Weight of A=180−111=69kg