There are an infinite amount of answers to that, such as:
802 + 89 = 891
770 + 121 = 891
850.5 + 40.5 = 891
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0.891 equals 891/1000.
As a product of its prime factors: 3*3*3*3*11 = 891
let the unknown no be x so, 178+x=891 transposing, x=891-178 x=713 unknown no is 713
891 ya 891
99