In what stairwell and on what floor 16 the floor house there is apartment 125 if on each floor on 4 apartments and numbering of apartments from the 1st floor

213
125/4=31.25=32 floor on the account as it is more than 31 floors, but less than 32 As in each stairwell on 16 floors: 32-16=16 floor of the second entrance of Answer: 125 apartment are in the second stairwell on the 16th floor
120
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