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Place the object to be weighed on a pan on one side of the scale.
Add objects with known weights to the pan on the other side of the scale until the beam connecting the pans is level. The pans may be mounted on the beam on the beam or they may hang from the beam. Either way, the beam should become level.
Calculate the weight of all the objects that were added to the second pan. That value is the weight of the object in the first pan..
if 10g weight is removed then we need to put other 10g to make it balane . And there's still 3 weight so we only need 7 and the 7 is your problem now not mine