2015 Sohu and Sina School Admissions pen test-12 Balance said an object 3 times to

There are 12 objects (eggs, iron, etc.), shapes, all of the same size. Among them, 11 of the same weight, the other 12 different. Today there is a balance point, you say 3 find some time, different objects (the weight of the object is different than the other 111 light or heavy unknown).

Solving:

The 12 objects are numbered sequentially from 1-12.

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2015 Sohu and Sina School Admissions pen test-12 Balance said an object 3 times to