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A uniform metre rule balance on A knife edge at the 55cm mark when a 40g is hung from the 95cm mark

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A uniform metre rule balance on A knife edge at the 55cm mark when a 40g is hung from the 95cm mark

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X(55-50) = 40(95-55)

 5X =40 x 40

  X =1600/5

   X =320g 

The weight of ruler is 320g.

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