A metre scale is balanced on a knife edge at its centre. When two coins, each of mass \( 10 \mat...

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A metre scale is balanced on a knife edge at its centre. When two coins, each of mass \( 10 \mathrm{~g} \) are put one on the top of the other at the \( 10.0 \mathrm{~cm} \) mark the scale is found to be balanced at \( 40.0 \mathrm{~cm} \) mark. The mass of the metre scale is found to be \( x \times 10^{-2} \mathrm{~kg} \). The value of \( x \) is
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