1. a uniform metre scale of weight 50 gf is balanced at the 40 cm mark when a weight of 100 gf is suspended at the 5 cm mark where of 80 gf be suspended to balanced the metre sacle ?
2. a sees-saw 8 m long is  balanced in the middle two children of mass 30 kgf and 40 kgf are sitting on the same side of the fulcrum at a distance of 1.5 m and 35 m from the fulcrum respecitvely where must a lady weighing   60 kgf sit from the fulcrum so as to blance the see- saw ?