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Can any one explain me this paper Q2 part c
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_21.pdf
Make the point P, the pivot. That means, Rope A has zero force. Now apply sum of anti-moments = Sum of clock-moments. You'll get the Rope B force.
Use it further through the same formula to find Tension in Rope A.