In the Guangdong and Shanghai Version Eight, "Substances Around Us" ppt review quality is an attribute of an object. It is not related to the shape, state, and position of the object. It is known to measure the quality of an object. When the balance is balanced on the balance, a 50g weight in the right plate , Two 20g weights, one 5g weight, the position of the travel code is the same as the above question, then the mass of the object is ____g.
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