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  4. A uniform metre scale balances at the 40 cm mark when weights of 10 g and 20 g are suspended from the 10-cm and 20-cm marks respectively. The weight of the metre scale is

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Q. A uniform metre scale balances at the $40\, cm$ mark when weights of $10\, g$ and $20\, g$ are suspended from the $10-cm$ and $20-cm$ marks respectively. The weight of the metre scale is

Solution:

$10 g \times 30+20 g \times 20=W \times 10$