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☞ Let ‘w’ be the mass of metre scale acting a mid point 50cm .
▼ Clockwise moments,
= 40 × (80 – 60)
= 40 × 20
= 800gfcm …….(i)
▼ Anti-Clockwise moments,
= 5 × (60 – 10) + w × (60 – 50)
= (250 + 10 w)gfcm ……..(ii)
=> 250+ 10w = 800
=> 10w = 800 - 250
=> w = 550/10