A uniform metre rule of mass 100 g is supported by a knife-edge at the 40 cm mark and a string at the 100 cm mark. The string passes round a frictionless pulley and carries a mass of 20 g as shown in the diagram.
At which mark on the rule must a 50 g mass be suspended so that the rule balances?

1 )
4 cm
2 )
36 cm
44 cm
4 )
96 cm
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