let the unknown no be x
so, 178+x=891
transposing,
x=891-178
x=713
unknown no is 713
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There are an infinite amount of answers to that, such as: 802 + 89 = 891 770 + 121 = 891 850.5 + 40.5 = 891
0.891 equals 891/1000.
As a product of its prime factors: 3*3*3*3*11 = 891
891 ya 891
divide 891 by the number of feet in one mile. There are 5280 feet in one mile. 0.16875 miles